If you understand the relationship between Scotopic and Photopic, you may be able to reduce your energy costs even further. You should demand the lowest wattage fixture as possible. This topic is relevent to energy efficiency because when you are re-designing a facility for new lighting, you may be able to reduce the wattage of your fixtures even further. How Does Scotopic vs Photopic Relate to Energy Efficiency? Scotopic lumen output also controls pupil size directly effecting visual acuity for tasks.Ĭommercial photometry only considers the photopic luminosity function, which was established in 1924 by the International Commission on Illumination (CIE), and has almost always been recognized as underestimating how the blue and violet end of the spectrum (where the eye shifts in scotopic conditions) contribute to perceived luminance. ![]() The second type is called scotopic lumens, which represent the sensitivity of the eye under typical lighting conditions and cannot be measured directly with a standard light meter.Photopic lumen output is the amount of light registered by cones in the human eye and is measured by standard lumen and footcandle meters. The first one is called photopic lumens, which represent the relative sensitivity of the eye under intense lighting (such as full outdoor sun).In lighting design there are two distinct kind of lumen output produced by lamps: Scotopic Lumens: How to look for a usable light. Looks impossible but in a lighting project you can have lower foot candle than before and actually have better light. ![]() Unfortunately high foot candles do not mean the lighting is always right. Lighting quality is not as simple as taking a light meter and getting high foot candle readings.
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