It would be advisable to illuminate a commercial office area to a level of 400-500 LUX but where the majority of work is computer based a lower level is acceptable. A domestic office environment of office for occasional use could be illuminated to a level of 250 LUX. The level of LUX needed in a space is obviously subjective but here are some examples to provide some indication of what is needed.Īreas for relaxation for instance lounge or TV rooms would typically have 120 LUX. For an area which where it is necessary to read in it would be advisable to increase this to 200LUX. This means that in a real situation you would achieve typically 35% of the light level that could theoretically be achieved in an optically perfect space. It is clear to see from this formula that the light level experienced is reduced by the 2 factors which are the maintenance factor of the lamp and the utilisation factor of the space.Ĭlearly these values are situation dependent but typical values for these would be 0.4 for the utilisation factor and 0.9 for the maintenance factor. ![]() MF is the maintenance factor for the lamp which allows for a level of light depreciation over time. UF is the utilisation factor for the space which takes into account the colouring of the surfaces in the space together with the geometry The LUX level in a room is calculated from the following formulaį is the average lumens value form the light source For instance the decor and colouring in the space will undoubtedly result in some loss of light unless the room has perfectly reflecting mirrored walls. Typically, the more lumens a light fixture provides, the brighter it is.Īlthough 1 lumen will theoretically produce 1 LUX of light over an area of 1 square metre this is only in the perfect world as there are other factors to consider. Lumens: The total output of visible light from a light source is measured in lumens. This can be thought of as light intensity within a specific area. ![]() Lux: The amount of light that is cast on a surface is called illuminance, which is measured in lux.
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