The science of measuring light, photometry, specifically applies to light in a space. Photometrics gauges how humans perceive light — its coverage area, where light cuts off and the intensity of light in relation to distance from the light source. In practical terms, photometrics shows whether a lighting plan meets the qualitative and quantitative lighting requirements for a project.
How much light is enough? Here’s everything you need to know when determining how much LED lighting is needed for a space. A lumen is a unit measurement of light. To calculate sufficient lumens, multiply the room’s square footage by the room’s foot-candle requirement.