Department of Energy – Efficient Lighting Strategies

Home , Accent lighting, Mining lamp

Technology Fact Sheet EFFICIENT LIGHTING STRATEGIES EFFICIENT LIGHTING STRATEGIES For more information, contact: LIGHTING PRINCIPLES AND TERMS temperatures (3600 to 5500 K) are what we EFFICIENT LIGHTING INITIAL DESIGN RECOMMENDATIONS • Also consider L IGHT QUANTITY Energy Efficiency and consider cool and lower color temperatures Home designers and builders can reduce lighting energy use - Light wall colors to minimize the need for artificial lighting. Renewable Energy The quantity of light emitted by lamps is (2700 to 3000 K) are considered warm. Cool STRATEGIES by selecting light fixtures and sources that use energy more Clearinghouse (EREC) measured in lumens. By way of reference, a ® light is preferred for visual tasks because it efficiently, and by installing controls to reduce the amount of - Energy Star lighting fixtures. 1-800-DOE-3732 100-watt incandescent lamp emits about 1750 produces higher contrast than warm light. Wise design choices can meet lighting needs time lights are on. - Occupancy detector controls. www.eren.doe.gov lumens. While the quantity of light produced Warm light is preferred for living spaces and save energy INDOORS OUTDOORS Or visit the Building by a lamp is measured in lumens, the purpose because it is more flattering to skin tones Technologies Program • Maximize the use of daylighting. • Security and utility lighting does not need to be bright to be of all lighting is to produce illumination (i.e., to and clothing. A color temperature of 2700 to Web site at INTRODUCTION Recent technological improvements allow provide light on a surface). The intensity of • Install fluorescent light fixtures for all ceiling- and wall- effective. www.buildings.gov 3600 K is generally recommended for most Convenient and effective artificial lighting is homeowners to substantially reduce the illumination is measured in footcandles. A mounted fixtures that will be on for more than 2 hours each • Use fluorescent, HID, or low-pressure sodium lights unless indoor general and task lighting applications. one of the important advances of the 20th energy they use for lighting without loss of footcandle is the illumination produced by one day. These often include the fixtures in the kitchen and living incandescent lights are automatically controlled to be on for Written and prepared for the • Color rendition refers to how colors appear Buildings for century. Artificial lighting allows us to work amenity. lumen distributed over a 1-square-foot area. room, and sometimes those in bathrooms, halls, bedrooms, just a few minutes each day. U.S. Department of Energy by: when illuminated by a light source and is the 21st Century and play inside and outside our homes For most home and office work, 30 to 50 independent of the time of day, and also often BENEFITS OF ADVANCED LIGHTING and other higher-demand locations. Install dedicated compact • Consider incandescent flood lights with combined Southface Energy Institute generally considered to be a more important footcandles of illumination is sufficient. For Buildings that are more Artificial lighting consumes almost 15 percent fluorescent fixtures, rather than CFLs in incandescent fixtures, 404-872-3549 lighting quality than color temperature. Most serves aesthetic purposes. Artificial lighting is photosensors and motion sensors in the place of other energy efficient, comfortable, www.southface.org detailed work, 200 footcandles of illumination generally employed for three types of uses: of household electricity. The traditional so that fluorescent bulbs continue to be used for the life of security lighting options. objects are not a single color, but a or more allows more accuracy and less and affordable…that’s the the house. incandescent bulb with screw base currently U.S. Department of Energy’s combination of many colors. Light sources goal of DOE’s Building Ambient lighting—Provides general • Make sure outdoor light fixtures have reflectors, deflectors, or eyestrain. For simply finding one’s way around provides most household illumination. Use of • Encourage occupants to use CFLs in portable lighting fixtures Oak Ridge National that are deficient in certain colors may Technologies Program. illumination indoors for daily activities and covers to make more efficient use of the light source and help Laboratory at night, 5 to 20 footcandles may be sufficient. new lighting technologies can reduce lighting that are operated for more than 2 hours a day. change the apparent color of an object. The To accelerate the development outdoors for safety and security. reduce light pollution. Buildings Technology Center energy use in homes by 50 to 75 percent. E FFICACY Color Rendition Index (CRI) is a 1 to 100 and wide application of energy Task lighting—Facilitates particular tasks that • If recessed lights are used in a ceiling with an unconditioned 865-574-5206 Advances in lighting controls offer further • In most applications, use One of the means to reduce lighting energy scale that measures a light source’s ability to efficiency measures, the space above it, use only Underwriters Laboratory (UL) www.ornl.gov/btc require more light than is needed for general - Photosensors to turn off lights during daylight hours. consumption is to use light sources that render colors the same way sunlight does. Building Technologies Program: energy savings by reducing the amount of approved fixtures that are airtight, are IC (insulation contact) U.S. Department of Energy’s illumination, such as under-counter lights in produce more light from little electricity. The The top value of the CRI scale (100) is based time lights are on but not serving a useful rated, and meet ASTM E283 requirements. - Motion detectors to activate security or utility lighting National Renewable Energy • Conducts R&D on technologies kitchens, table lamps, or bathroom mirror lights. ratio of light produced to energy consumed is purpose. Advanced lighting controls also offer when needed. Laboratory on illumination by a 100-watt incandescent and concepts for energy effi- Accent lighting—Draws attention to special a new amenity—lights that come on 303-275-3000 called efficacy. Efficacy is measured as the light bulb. A light source with a CRI of 80 or ciency, working closely with - Timers and other controls to turn decorative lighting on features or enhances the aesthetic qualities of www.nrel.gov/buildings number of lumens produced divided by the higher is considered acceptable for most the building industry and with automatically when they are needed. and off. an indoor or outdoor environment. rate of electricity consumption (lumens indoor residential applications. manufacturers of materials, per watt). equipment, and appliances • Glare refers to excessive brightness from a • Promotes energy/money DEDICATED COMPACT FLUORESCENT FIXTURES L IGHT QUALITY direct light source that makes it difficult to INDOOR/OUTDOOR LIGHTING TYPES

○○○○○○○○○○○○○○○ saving opportunities to both Installing compact fluorescent fixtures that accept only Three concepts are important to understand see what one wishes to see. A bright object There are varied lighting technologies for all lighting situations. Consideration should be given builders and buyers of homes CFLs ensures lifelong energy-saving benefits. Many new lighting quality: in front of a dark background usually will to energy-efficient lighting choices in fixtures that are on for more than 2 hours a day. and commercial buildings CFL fixtures offer a dimmable feature and perform much like • Color temperature refers to the color of the cause glare. Bright lights reflecting off a • Works with state and local Utility lighting incandescent fixtures. light source. By convention, yellow-red television or computer screen or even a regulatory groups to improve colors (like the flames of a fire) are printed page produce glare. Intense light building codes, appliance Pole-mounted considered warm, and blue-green colors (like sources such as bright incandescent lamps lighting standards, and guidelines for light from an overcast sky) are considered are likely to produce more direct glare than efficient energy use

LIGHTING DESIGN CONCEPTS home but little direct sun during the summer, especially when Fluorescent lamps use 25 to 35 percent of the energy used by EXTERIOR LIGHTING OPTIONS Energy-efficient lighting design focuses on methods and properly shaded. North-facing windows are also advantageous incandescent lamps to provide the same amount of OCCUPANCY SENSORS Exterior lighting for homes generally serves one or a MOTION SENSORS Home automation can be achieved on a small scale through Outdoor motion sensors have revolutionized outdoor materials that improve both quality and efficiency of lighting. for daylighting because they admit relatively even, natural light, illumination (efficacy of 30 to 110 lumens per watt) and last combination of three principal purposes: aesthetics— smart switches. Occupancy sensors provide individual lighting and security strategies. Economical models offer Energy-efficient lighting design principles include the following: producing little glare and almost no unwanted summer heat about 10 times longer (7,000 to 24,000 hours). Improvements illuminate the exterior of the house and landscape, security— switching and timing for room lights and other fixtures. sophisticated features and energy-saving benefits. • Keep in mind that more light is not necessarily better. Human gain. Although east- and west-facing windows provide good in technology have resulted in fluorescent lamps with color placed on poles or high on the building to illuminate the visual performance depends on light quality as well as quantity. daylight penetration in the morning and evening, respectively, temperature and color rendition that are comparable to grounds near the house or driveway, and utility—illuminate they should be limited because they may cause glare, admit a incandescent lamps. porch and driveway to help people navigate safely to and from • Match the amount and quality of light to the performed lot of heat during the summer when it is usually not wanted, the house. function. Fluorescent lamps require a ballast to regulate operating and contribute little to solar heating during the winter. O UTDOOR LIGHTING TECHNOLOGIES • Install task lights where needed and reduce ambient light current and provide a high start-up voltage. Electronic ballasts Incandescent lamps are the most commonly used outdoor elsewhere. I NDOOR LIGHTING TECHNOLOGIES outperform standard and improved electromagnetic ballasts by Incandescent lighting has traditionally delivered about 85 operating at a very high frequency that eliminates flicker and lights around homes. • Use energy-efficient lighting components, controls, and systems. percent of household illumination. Incandescents operate without noise. They are also more energy-efficient. Special ballasts are Fluorescent lamps are not always suitable for outdoor use • Maximize the use of daylighting. a ballast, are dimmable and instantly controllable, and light up needed to allow dimming of fluorescent lamps. because they may not operate well at temperatures below 40°F. instantly. Most familiar are the standard pear-shaped, screw-in However, some CFLs are specially designed to operate at low INTERIOR LIGHTING OPTIONS Two general types of fluorescent lamps are available. The “A”-type incandescent light bulbs. They produce a warm light and traditional tube-type fluorescent is usually identified as T12 or temperatures down to –20°F for outdoor use. D AYLIGHTING provide excellent color rendition. They have a low efficacy Daylighting is the use of windows and skylights to bring T8 (12/8 or 8/8 of an inch tube diameter, respectively) and is High-intensity discharge (HID) and low-pressure sodium compared to all other lighting options (10 to 17 lumens per watt) daylight into the home. Today’s highly efficient windows and installed in a dedicated fixture with a built-in ballast. The newer lamps are suitable for some outdoor lighting purposes. The and a short average operating life (750 to 2500 hours). advances in lighting design allow efficient use of windows to compact fluorescent lamps (CFLs) and circulines have smaller most common types of HID lamps are mercury vapor, metal Incandescent lamps can be made in other shapes and diameters and are usually bent or twisted into compact shapes. halide, and high-pressure sodium—all of which are much more reduce the need for artificial lighting during daylight hours Motion sensors automatically turn outdoor lights on when variations. Tungsten halogen lamps provide excellent color These are frequently sold with built-in or separate electronic efficient than incandescent lamps. Metal halide lamps produce without causing heating or cooling problems. The sizes and they are needed (when motion is detected) and turn them off a rendition. Reflector (R) and parabolic aluminized reflector ballasts and screw thread adapters for application in fixtures a bright, white light with fair color rendition, have a lifetime of locations of windows should be based on the cardinal short while later. They are very useful for outdoor security and (PAR) lamps direct light in a desired direction. All three are designed for incandescent bulbs. Dedicated fixtures that are about 6,000 hours, and are more efficient than mercury vapor directions rather than their effect on the street-side appearance Occupancy sensors detect activity within a certain area. They utility lighting provided by incandescent lamps. of the house, for example. South-facing windows are most slightly more efficient than standard bulbs, have longer equipped with electronic ballasts and that use plug-in (pin) lamps. Mercury vapor and high-pressure sodium lamps have provide convenience by turning lights on automatically when Because utility lights and some applications of security lights advantageous for daylighting and for moderating seasonal operating lives (2000 to 4000 hours), and are often used for CFLs are also available. poorer color rendition but longer lifetimes (16,000 to 24,000 someone enters a room. They reduce lighting energy use by are needed only when it is dark and people are present, the temperatures because they allow most winter sunlight into the accent lighting. hours). Mercury vapor lamps have an efficacy of about 50 I NDOOR LIGHTING CONTROLS turning lights off soon after the last occupant has left the best controller may be a combination of motion sensor to turn The traditional on-off toggle switch has long been the lighting lumens per watt, while high-pressure sodium lamps have an room. Occupancy sensors must be located where they will on lights when people are present and photosensor to prevent control of choice in homes. For rooms with two entrances, efficacy of 50 to 140 lumens per watt. Low-pressure sodium detect occupants or occupant activity in all parts of the room. lights from operating during daylight hours. Incandescent lights are the most efficient and have long lifetimes (12,000 to BULB COMPARISON CHART ycaciffE emitefiL xedninoitidnerroloC erutarepmetroloC three-way switches make it more convenient to turn off lights There are two types of occupancy sensors: ultrasonic and )ttaw/snemul( )sruoh( )IRC( )K( flood lights with photosensor and motion detector controls when leaving the room. However, experience shows that even 18,000 hours), but they have very poor color rendition. HID infrared. Ultrasonic sensors detect sound, while infrared may actually use less energy than pole-mounted HID or low- Incandescent and low-pressure sodium lights require up to ten minutes to with convenient light switch locations, lights are often left on sensors detect heat and motion. In addition to controlling S7blub"A"dradnat 101-0 7)052-05 9)tnellecxE(001-8 mraW(0082-0072 pressure sodium security lights controlled by a photosensor. when rooms are unoccupied. start and have to cool before they can restart, so they are most ambient lighting in a room, they are useful for task lighting Even though HID and low-pressure sodium lights are more T2negolahnetsgnu 102-2 2)004-000 9)tnellecxE(001-8 lartuenotmraW(0023-0092 suitable for applications where they stay on for hours at a time. Dimmer controls provide variable lighting for fixtures. Off-the- applications, such as over kitchen counters. In such efficient than incandescents, they are turned on for a much R9)R(rotcelfe 101-2 2)003-000 9)tnellecxE(001-8 mraW(0082 They are not suitable for use with motion detectors. shelf switches for incandescent fixtures are inexpensive and applications, task lights are turned on by the motion of a longer period of time than incandescents using these dual P9)RAP(rotcelferdezinimulacilobara 101-2 2)003-000 9)tnellecxE(001-8 mraW(0082 provide some energy savings when lights are used at a reduced person washing dishes, for instance, and automatically turn off O UTDOOR LIGHTING CONTROLS controls. Fluorescent level. Fluorescent dimmers are dedicated fixtures and bulbs a few minutes after the person stops. Outdoor lights are often controlled by toggle switches, but it is Simple timers are not often used alone for outdoor lighting S0ebutthgiart 3011-0 7)00,42-000 5)doogotriaF(09-0 dlocotmraW(0056-0072 easy for occupants to forget to turn the lights off when they that provide even greater energy savings than a regular Timers are sometimes used to give unoccupied houses a lived- C0)LFC(pmaltnecseroulftcapmo 507-0 1)00,0 6)dooG(88-5 dlocotmraW(0056-0072 because the timer may have to be reset often with the seasonal fluorescent bulb. are not needed. Two controls that are especially useful with in look. However, they are an ineffective control for an variation in the length of night. However, they can be used C0enilucri 405-0 00,21 outdoor lighting are photosensors and motion sensors. Photosensors have little utility in controlling lights inside the occupied home because they do not respond to changes in Outdoor Lighting effectively in combinations with other controls. For example, the home because lighting needs vary with occupant activity rather occupant behavior. Photosensors sense ambient light conditions and are used to M0ropavyrucre 206-5 1)00,42-000,6 5)riafotrooP(0 dlocotmraW(0007-0023 best combination for aesthetic (decorative) lighting may be a than ambient lighting levels. prevent outdoor lights from operating during daylight hours. M5edilahlate 7011-0 5)00,02-000 7)riaF(0 dloC(0073 photosensor that turns lights on in the evening and a timer that They are useful with all forms of outdoor lighting. turns the lights off at a certain hour of the night (e.g., 11 P.M.). H0muidoserusserp-hgi 5041-0 1)00,42-000,6 2)rooP(5 mraW(0012 L0p muidoserusser-wo 6051-0 1)00,81-000,2 roopyreV(44- Technology Fact Sheet EFFICIENT LIGHTING STRATEGIES EFFICIENT LIGHTING STRATEGIES For more information, contact: LIGHTING PRINCIPLES AND TERMS temperatures (3600 to 5500 K) are what we EFFICIENT LIGHTING INITIAL DESIGN RECOMMENDATIONS • Also consider L IGHT QUANTITY Energy Efficiency and consider cool and lower color temperatures Home designers and builders can reduce lighting energy use - Light wall colors to minimize the need for artificial lighting. Renewable Energy The quantity of light emitted by lamps is (2700 to 3000 K) are considered warm. Cool STRATEGIES by selecting light fixtures and sources that use energy more Clearinghouse (EREC) measured in lumens. By way of reference, a ® light is preferred for visual tasks because it efficiently, and by installing controls to reduce the amount of - Energy Star lighting fixtures. 1-800-DOE-3732 100-watt incandescent lamp emits about 1750 produces higher contrast than warm light. Wise design choices can meet lighting needs time lights are on. - Occupancy detector controls. www.eren.doe.gov lumens. While the quantity of light produced Warm light is preferred for living spaces and save energy INDOORS OUTDOORS Or visit the Building by a lamp is measured in lumens, the purpose because it is more flattering to skin tones Technologies Program • Maximize the use of daylighting. • Security and utility lighting does not need to be bright to be of all lighting is to produce illumination (i.e., to and clothing. A color temperature of 2700 to Web site at INTRODUCTION Recent technological improvements allow provide light on a surface). The intensity of • Install fluorescent light fixtures for all ceiling- and wall- effective. www.buildings.gov 3600 K is generally recommended for most Convenient and effective artificial lighting is homeowners to substantially reduce the illumination is measured in footcandles. A mounted fixtures that will be on for more than 2 hours each • Use fluorescent, HID, or low-pressure sodium lights unless indoor general and task lighting applications. one of the important advances of the 20th energy they use for lighting without loss of footcandle is the illumination produced by one day. These often include the fixtures in the kitchen and living incandescent lights are automatically controlled to be on for Written and prepared for the • Color rendition refers to how colors appear Buildings for century. Artificial lighting allows us to work amenity. lumen distributed over a 1-square-foot area. room, and sometimes those in bathrooms, halls, bedrooms, just a few minutes each day. U.S. Department of Energy by: when illuminated by a light source and is the 21st Century and play inside and outside our homes For most home and office work, 30 to 50 independent of the time of day, and also often BENEFITS OF ADVANCED LIGHTING and other higher-demand locations. Install dedicated compact • Consider incandescent flood lights with combined Southface Energy Institute generally considered to be a more important footcandles of illumination is sufficient. For Buildings that are more Artificial lighting consumes almost 15 percent fluorescent fixtures, rather than CFLs in incandescent fixtures, 404-872-3549 lighting quality than color temperature. Most serves aesthetic purposes. Artificial lighting is photosensors and motion sensors in the place of other energy efficient, comfortable, www.southface.org detailed work, 200 footcandles of illumination generally employed for three types of uses: of household electricity. The traditional so that fluorescent bulbs continue to be used for the life of security lighting options. objects are not a single color, but a or more allows more accuracy and less and affordable…that’s the the house. incandescent bulb with screw base currently U.S. Department of Energy’s combination of many colors. Light sources goal of DOE’s Building Ambient lighting—Provides general • Make sure outdoor light fixtures have reflectors, deflectors, or eyestrain. For simply finding one’s way around provides most household illumination. Use of • Encourage occupants to use CFLs in portable lighting fixtures Oak Ridge National that are deficient in certain colors may Technologies Program. illumination indoors for daily activities and covers to make more efficient use of the light source and help Laboratory at night, 5 to 20 footcandles may be sufficient. new lighting technologies can reduce lighting that are operated for more than 2 hours a day. change the apparent color of an object. The To accelerate the development outdoors for safety and security. reduce light pollution. Buildings Technology Center energy use in homes by 50 to 75 percent. E FFICACY Color Rendition Index (CRI) is a 1 to 100 and wide application of energy Task lighting—Facilitates particular tasks that • If recessed lights are used in a ceiling with an unconditioned 865-574-5206 Advances in lighting controls offer further • In most applications, use One of the means to reduce lighting energy scale that measures a light source’s ability to efficiency measures, the space above it, use only Underwriters Laboratory (UL) www.ornl.gov/btc require more light than is needed for general - Photosensors to turn off lights during daylight hours. consumption is to use light sources that render colors the same way sunlight does. Building Technologies Program: energy savings by reducing the amount of approved fixtures that are airtight, are IC (insulation contact) U.S. Department of Energy’s illumination, such as under-counter lights in produce more light from little electricity. The The top value of the CRI scale (100) is based time lights are on but not serving a useful rated, and meet ASTM E283 requirements. - Motion detectors to activate security or utility lighting National Renewable Energy • Conducts R&D on technologies kitchens, table lamps, or bathroom mirror lights. ratio of light produced to energy consumed is purpose. Advanced lighting controls also offer when needed. Laboratory on illumination by a 100-watt incandescent and concepts for energy effi- Accent lighting—Draws attention to special a new amenity—lights that come on 303-275-3000 called efficacy. Efficacy is measured as the light bulb. A light source with a CRI of 80 or ciency, working closely with - Timers and other controls to turn decorative lighting on features or enhances the aesthetic qualities of www.nrel.gov/buildings number of lumens produced divided by the higher is considered acceptable for most the building industry and with automatically when they are needed. and off. an indoor or outdoor environment. rate of electricity consumption (lumens indoor residential applications. manufacturers of materials, per watt). equipment, and appliances • Glare refers to excessive brightness from a • Promotes energy/money DEDICATED COMPACT FLUORESCENT FIXTURES L IGHT QUALITY direct light source that makes it difficult to INDOOR/OUTDOOR LIGHTING TYPES

cool. Color temperature is measured in Kelvin large fluorescent lamps. However, glare is Flood ○○○○○○○○○○ lighting Insulation Contact (IC) rated recessed NOTICE: Neither the United (K) temperature. Confusingly, higher Kelvin primarily the result of relative placement of fixtures allow complete coverage of States government nor any agency thereof, nor any of their light sources and the objects being viewed. insulation in attic installations. employees, makes any warranty, express or implied, or assumes any legal liability or responsibility Task lighting for the accuracy, completeness, Accent lighting or usefulness of any information, Accent lighting apparatus, product, or process Ambient lighting disclosed. The views and opin- ions of authors expressed herein do not necessarily state or reflect Printed with a renewable-source ink on paper containing at least 50% wastepaper, including 20% postconsumer waste. those of the United States gov- BUILDING TECHNOLOGIES PROGRAM December 2002 DOE/GO-102002-0787 ernment or any agency thereof. OFFICE OF ENERGY EFFICIENCY AND RENEWABLE ENERGY • U.S. DEPARTMENT OF ENERGY Technology Fact Sheet EFFICIENT LIGHTING STRATEGIES EFFICIENT LIGHTING STRATEGIES For more information, contact: LIGHTING PRINCIPLES AND TERMS temperatures (3600 to 5500 K) are what we EFFICIENT LIGHTING INITIAL DESIGN RECOMMENDATIONS • Also consider L IGHT QUANTITY Energy Efficiency and consider cool and lower color temperatures Home designers and builders can reduce lighting energy use - Light wall colors to minimize the need for artificial lighting. Renewable Energy The quantity of light emitted by lamps is (2700 to 3000 K) are considered warm. Cool STRATEGIES by selecting light fixtures and sources that use energy more Clearinghouse (EREC) measured in lumens. By way of reference, a ® light is preferred for visual tasks because it efficiently, and by installing controls to reduce the amount of - Energy Star lighting fixtures. 1-800-DOE-3732 100-watt incandescent lamp emits about 1750 produces higher contrast than warm light. Wise design choices can meet lighting needs time lights are on. - Occupancy detector controls. www.eren.doe.gov lumens. While the quantity of light produced Warm light is preferred for living spaces and save energy INDOORS OUTDOORS Or visit the Building by a lamp is measured in lumens, the purpose because it is more flattering to skin tones Technologies Program • Maximize the use of daylighting. • Security and utility lighting does not need to be bright to be of all lighting is to produce illumination (i.e., to and clothing. A color temperature of 2700 to Web site at INTRODUCTION Recent technological improvements allow provide light on a surface). The intensity of • Install fluorescent light fixtures for all ceiling- and wall- effective. www.buildings.gov 3600 K is generally recommended for most Convenient and effective artificial lighting is homeowners to substantially reduce the illumination is measured in footcandles. A mounted fixtures that will be on for more than 2 hours each • Use fluorescent, HID, or low-pressure sodium lights unless indoor general and task lighting applications. one of the important advances of the 20th energy they use for lighting without loss of footcandle is the illumination produced by one day. These often include the fixtures in the kitchen and living incandescent lights are automatically controlled to be on for Written and prepared for the • Color rendition refers to how colors appear Buildings for century. Artificial lighting allows us to work amenity. lumen distributed over a 1-square-foot area. room, and sometimes those in bathrooms, halls, bedrooms, just a few minutes each day. U.S. Department of Energy by: when illuminated by a light source and is the 21st Century and play inside and outside our homes For most home and office work, 30 to 50 independent of the time of day, and also often BENEFITS OF ADVANCED LIGHTING and other higher-demand locations. Install dedicated compact • Consider incandescent flood lights with combined Southface Energy Institute generally considered to be a more important footcandles of illumination is sufficient. For Buildings that are more Artificial lighting consumes almost 15 percent fluorescent fixtures, rather than CFLs in incandescent fixtures, 404-872-3549 lighting quality than color temperature. Most serves aesthetic purposes. Artificial lighting is photosensors and motion sensors in the place of other energy efficient, comfortable, www.southface.org detailed work, 200 footcandles of illumination generally employed for three types of uses: of household electricity. The traditional so that fluorescent bulbs continue to be used for the life of security lighting options. objects are not a single color, but a or more allows more accuracy and less and affordable…that’s the the house. incandescent bulb with screw base currently U.S. Department of Energy’s combination of many colors. Light sources goal of DOE’s Building Ambient lighting—Provides general • Make sure outdoor light fixtures have reflectors, deflectors, or eyestrain. For simply finding one’s way around provides most household illumination. Use of • Encourage occupants to use CFLs in portable lighting fixtures Oak Ridge National that are deficient in certain colors may Technologies Program. illumination indoors for daily activities and covers to make more efficient use of the light source and help Laboratory at night, 5 to 20 footcandles may be sufficient. new lighting technologies can reduce lighting that are operated for more than 2 hours a day. change the apparent color of an object. The To accelerate the development outdoors for safety and security. reduce light pollution. Buildings Technology Center energy use in homes by 50 to 75 percent. E FFICACY Color Rendition Index (CRI) is a 1 to 100 and wide application of energy Task lighting—Facilitates particular tasks that • If recessed lights are used in a ceiling with an unconditioned 865-574-5206 Advances in lighting controls offer further • In most applications, use One of the means to reduce lighting energy scale that measures a light source’s ability to efficiency measures, the space above it, use only Underwriters Laboratory (UL) www.ornl.gov/btc require more light than is needed for general - Photosensors to turn off lights during daylight hours. consumption is to use light sources that render colors the same way sunlight does. Building Technologies Program: energy savings by reducing the amount of approved fixtures that are airtight, are IC (insulation contact) U.S. Department of Energy’s illumination, such as under-counter lights in produce more light from little electricity. The The top value of the CRI scale (100) is based time lights are on but not serving a useful rated, and meet ASTM E283 requirements. - Motion detectors to activate security or utility lighting National Renewable Energy • Conducts R&D on technologies kitchens, table lamps, or bathroom mirror lights. ratio of light produced to energy consumed is purpose. Advanced lighting controls also offer when needed. Laboratory on illumination by a 100-watt incandescent and concepts for energy effi- Accent lighting—Draws attention to special a new amenity—lights that come on 303-275-3000 called efficacy. Efficacy is measured as the light bulb. A light source with a CRI of 80 or ciency, working closely with - Timers and other controls to turn decorative lighting on features or enhances the aesthetic qualities of www.nrel.gov/buildings number of lumens produced divided by the higher is considered acceptable for most the building industry and with automatically when they are needed. and off. an indoor or outdoor environment. rate of electricity consumption (lumens indoor residential applications. manufacturers of materials, per watt). equipment, and appliances • Glare refers to excessive brightness from a • Promotes energy/money DEDICATED COMPACT FLUORESCENT FIXTURES L IGHT QUALITY direct light source that makes it difficult to INDOOR/OUTDOOR LIGHTING TYPES