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Office Lighting Fact Sheet

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Office Lighting Fact Sheet Office Lighting A fact sheet prepared by the Ergonomic Committee of the National Telecommunications Safety Panel INTRODUCTION Awkward Posture Office work is visually Trying to correct a lighting problem such as glare can demanding and has inadvertently cause a person to assume an awkward always required good position such as tilting the neck side to side or backwards. lighting for preventing eyestrain, improving This may lead to shoulder and neck discomfort comfort, and increasing productivity. Contributing Factors include: Poor lighting in today’s Glare from the un-shaded or office can mean un-diffused lighting fixtures anything from lighting or windows. that causes glare, to Poor lighting, involving overly bright lights, improperly placed lights or dim illumination levels that are lighting."Good" lighting means providing enough too high or low and cannot illumination in specific areas so people can see printed, be adjusted. handwritten or displayed documents clearly, while not High intensity overall office over illuminating areas where computer work is lighting that washes out performed. images on the screen. Additional contributing factors include: This fact sheet discusses the ergonomic, safety and Monitors that are either too far away or poorly angled in health aspects of office lighting and does not address relation to the location of the user’s eyes. energy saving aspects of designing or retrofitting office Characters/letters that are too small on the monitor lighting. Vision Problems WHAT IS LIGHT? Reduced visual ability and eye discomfort are the The simplest definition of light is “visually perceived predominate vision problems associated with improper radiant energy”. lighting. They have collectively been termed Computer As visually perceived radiant energy, light powers the Vision Syndrome (CVS) in the media. This can lead to: mechanism of sight. It is light, reflected from objects to our eyes that allow Dry, irritated or burning eyes us to see. Blurred vision Headaches HOW DO CONDITIONS AFFECT OUR VISUAL Upper back, neck and shoulder discomfort PERFORMANCE? The ability to "see" at work depends not only on lighting Contributing factors include: but also on: Focusing your eyes on objects at the same distance and angle for prolonged periods of time The motion of an object. Fast moving objects are Poor contrast between the characters on the screen more difficult to see. and the background on the monitor or between the The size of an object. Very small objects are hard to brightness of the monitor and the brightness of the see. office space behind the monitor Brightness. Too much or too little reflected light Inadequate breaks while working with a computer impacts the perception of the object. Uncorrected vision may be an additional source of Contrast between an object and its immediate eye discomfort. background. Too little contrast makes an object hard The ability to focus on objects at various distances to distinguish from the background. decreases with age (presbyopia). Commonly, by age forty, people start having trouble clearly seeing WHAT ARE THE RISK FACTORS ASSOCIATED WITH objects at close range with the naked eye. This is a OFFICE LIGHTING HAZARDS? gradual change, and has to be regarded as an important component in designing visual Through the OSHA and NTSP Alliance, NTSP developed this fact sheet for informational purposes only. It does not necessarily reflect the official views of OSHA or the U.S. Department of Labor. The information and material contained in this document has been developed from sources believed to be reliable. However, NTSP accepts no legal responsibility for the correctness or completeness of this material or its application to specific factual situations. By publication of this fact sheet, NTSP does not ensure that adherence to these recommendations will protect the safety or health of any persons or preserve property. Page 1 of 4 05 / 2009 Office Lighting A fact sheet prepared by the Ergonomic Committee of the National Telecommunications Safety Panel environments, particularly when the job involves Use moisturizing eye drops if your eyes begin to feel computer work dry or gritty. NOTE: This means “moisturizing eye drops” not the products that contain vasoconstrictors WHAT ARE RECOMMENDED SHORT TERM designed to “get the red out”. STRATEGIES TO ADDRESS THESE RISK FACTORS? Frequently exercise your eye muscles as follows to Short term strategies represent something the worker can prevent feelings of fatigue. do to improve comfort themselves. These include: Look around. Focus your vision on distant objects. Adjust the Monitor Blink frequently . Use a light color for the screen background and dark characters / letters. Maintain Lighting Fixtures . Angle the monitor away Replace bulbs on a scheduled basis. Old bulbs tend to from lights and windows. flicker more and they are not as bright. If using a task light, make sure that the task lamp Training illuminates the document In addition, Management should provide training and not the monitor. regarding the proper use of computer workstations. Clean the monitor screen regularly to remove dust particles which can reduce WHAT ARE RECOMMENDED LONG TERM legibility. STRATEGIES TO ADDRESS THESE RISK FACTORS? . Adjust the brightness and contrast according to your If the existing lighting system cannot effectively be Preference. adjusted or maintained to improve worker comfort and . Fairly sharp images and adequate contrast ratios productivity, a long term strategy should be considered. of approximately 10:1 (image brightness to This may involve modification to existing lighting or a new background) are typically required to make a overhead lighting system may be warranted. These display easier to read. activities are best performed by the Property Management . What is acceptable to an individual will depend on personnel for the office. character size, viewing distance and the type of task being done. Specific strategies for modification and design of new . Consider using a hood over the top of the monitor to lighting system include the following: reduce the amount of light that hits the screen. Consider using LCD monitors which are less Proper lighting susceptible to the effects of excessive ambient light. Proper lighting is critical for a comfortable and productive . Use an anti-glare screen if other adjustments don’t work environment. It is important that the general lighting eliminate the problem. provide effective illumination for most workers in an area. The optimal lighting level will depend on the task. Too Make Personal Vision Corrections much light can be as fatiguing as not enough. Check your vision every one or two years, as recommended by your eye specialist. Choose the appropriate amount of light Provide your eye examiner with information about Office-based work involving computers that also use your job. paper documents should target an illuminance in the Every few minutes, look away from the screen for a range of 200 to 500 lux (20-50 foot-candles) few seconds. Work using computers alone (without referencing Consider using task-specific computer glasses. paper documents) should target the lower range of Depending on the amount of time you work at a lighting at or below 200 lux (20 foot-candles.) computer, the kind of vision correction you need, and Generally the maximum lighting should not exceed your personal preferences, your eye specialist may 750 lux. Excessive lighting levels have a “masking” recommend bifocals, trifocals or even a separate pair effect and make it difficult for the operator to see the of glasses for computer work. display on the screen Through the OSHA and NTSP Alliance, NTSP developed this fact sheet for informational purposes only. It does not necessarily reflect the official views of OSHA or the U.S. Department of Labor. The information and material contained in this document has been developed from sources believed to be reliable. However, NTSP accepts no legal responsibility for the correctness or completeness of this material or its application to specific factual situations. By publication of this fact sheet, NTSP does not ensure that adherence to these recommendations will protect the safety or health of any persons or preserve property. Page 2 of 4 05 / 2009 Office Lighting A fact sheet prepared by the Ergonomic Committee of the National Telecommunications Safety Panel Diffusers are translucent or semi-transparent (see- Note: A lux should be measured on the work surface with through) covers made usually of glass or plastic. They a light meter. It is a unit equivalent to the illumination cast are used on the bottom or sides of light fixtures to on a surface by one candle one meter away, which is control brightness. equal to one fifth to one tenth of a foot-candle. Lenses are clear or transparent glass, or plastic covers. The lens design incorporates prisms and flutes to Choose lighting types appropriate to the task. distribute light in specific ways Louvers are baffles that shield the bulb from view and reflect light. Choose the appropriate color of light Light and color are inextricably connected; in a sense, light is color. The color temperature (Kelvin) of a light source is a numerical measurement of its color appearance. General or ceiling lighting provides fairly uniform The Perception of lighting throughout the work area. Color is the way color Local lighting uses fixtures closer to the work surface groups are perceived – in addition to ceiling fixtures to increase lighting levels or the psychological for particular tasks impact of lighting. Task lighting increases light levels over the work and Colors and light immediate surroundings. Task lighting often allows sources from the the user to adjust and control lighting and provides violet/blue end of flexibility for each user. the spectrum are referred to as “cool,” Choose lighting fixtures appropriate to the workspace Those toward the red/orange/yellow side are No single type of light fixture is appropriate in every “warm” (soft white) situation.
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