Suggested Light Levels

SUGGESTED LIGHT LEVELS Application Footcandle Level How Measured AUDITORIUMS

Social Activities 5 Measured average

Assembly only 10 Measured average

Exhibitions 30 Measured at exhibit

GYMNASIUMS

Assemblies 10 Measured average

General exercise & recreation 30 Measured average

Exhibitions, matches 50 Measured average

OFFICES

Corridors, stairways 5-10 (or not less than 1/5 of Measured average (at floor) the level in adjacent areas) Reading, transcribing 70 Measured at work station

Regular office work 40-60 Measured at work station

Prolonged office work 55-90 Measured at work station

Visually difficult office work 80-210 Measured at work station

BUILDING EXTERIORS

Active (pedestrian and/or 5 Measured average conveyance Inactive (normally locked, 1 Measured average infrequently used) Vital locations or structures 5 Measured average

Building surrounds 1 Measured average

SCHOOLS

Reading printed material 30 Measured at work area (on desk) Reading pencil writing 70 Measured at work area

Drafting, benchwork 100 Measured at work area

Lip reading, chalkboards, 50-100 Measured at work area (i.e. on sewing chalkboard) CLASSROOMS

Art rooms 70 Measured average

Drafting rooms 100 Measured average

Sewing room 150 Measured average

Cooking room 100 Measured average

Note taking 30 Measured work area

LABORATORIES

Dissection, experiments, etc. 100 Measured work area

LECTURE ROOMS

Audience area 30 Measured average

Demonstration area 50-100 Measured work area

MUSIC ROOMS

Simple scores 30 Measured work area

Advanced scores 70 Measured work area

Operate Machinery 100 Measured work area

STUDY HALLS/LIBRARY/COMPUTER LAB

Studying/typing 30 Measured work area TYPICAL SCHOOL LIGHTING TECHNOLOGIES

Specific Lighting Technologies Watts are for bulb only; multiplier in Worksheet, Column D adjusts for ballast wattage.

Type Watts Lumens Where Used How to Recognize Incandescent: Overall room lighting; display & Standard accent lighting 25 W 25 215 60 W 60 860 100 W 100 1,750 filament burns very hot Incandescent: Highly effective "PAR"(Parabolic reflective flood light used for aluminized reflectors) recessed indoor 75 W lighting & 100 W 75 1,200 outside lighting 150 W 100 1,750 have very thick glass 150 2,580 Incandescent: Reflective flood light used for "R" (Reflector) recessed lighting; indoor only 75 W 75 1,200 100 W 100 1,750 150 W 150 2,580

have very thin glass Incandescent: Outside safety lighting Tubular quartz halogen 500 WQ 500 10,600 have a very long filament; 1000 WQ 1000 23,100 produce clear, white light

Fluorescent: R/PAR for overall room lighting; • Desk/table types: CFL (compact small CFLs desk/table lamps fluorescent lamp) 5 W 5 250 28 W 28 1,800 Fluorescent: Overall room lighting Tubular 4ft T12 Standard 40 3,050 T12"Supersaver" 34 2,850 1 1/2" diam., 4 ft. long tubes found in rectangular housing; may have 1 - 4 lamps; will cast a shadow or can actually be seen, depending on housing Fluorescent Overall room lighting 1 1/2 " diam., 8 ft. long tubes Tubular 8 ft in long rectangular housing T12 Standard 75 6,000 typically containing two tubes; T12"Supersaver" 60 5,800 see above to count number of tubes Fluorescent Overall room lighting 1"diam.; 4 ft. long tubes in Tubular 4 ft rectangular housing; see above T8 Standard 32 2,900 to count tubes Fluorescent Overall room lighting U-tube Standard 40 3,050 "Supersaver" 34 2,850 HID (high intensity Outside safety lighting; sometimes discharge): Mercury in gyms Vapor 175 W 175 7,300 Have a clear "arc" tube inside 400 W 400 21,000 the lamp; bluish light HID: Metal Halide Used in gyms & other spaces with Resemble HID mercury vapor 400 W high ceilings; mostly for outdoor lamps; 1000 W 400 32,000 lighting Look for white caps on one or 1000 _____ both arc tube ends; very bright light HID: High pressure Mostly used for safety and Resemble mercury vapor sodium roadway lighting lights; 70 W 70 6,300 have very slender, ceramic arc 100 W 100 9,500 tube 400 W 400 50,000