![]() H = distance between the lamp and the horizontal target ![]() To calculate for your recommended footcandle multiplier, use the following formulas: You do that with a footcandle multiplier. If you have high ceilings in a space, then you must account for that in your lumens calculation. If your ceiling height is below 10ft, the Lumen Method above and the lumens calculator below will be sufficient for determining the required light output for your application. Note: Only read this section if your ceiling height is taller than 10ft. A 100-square foot dining room, which needs 40 foot-candles, will need 4,000 lumens.ĭownload a Free Footcandle Chart » Factoring in Lumen Lighting Variables Ceiling Height Variable For example, a 100-square foot living room, which needs 20 foot candles, will need 2,000 lumens. Multiply your room square footage by the footcandle requirement. Let’s recap how to gauge how much light you need for a space. Summary: Calculating Total Lumens Needed for a Room Residential Lighting Footcandle Requirements Room Footcandle Requirements for Various Applications Commercial Lighting Footcandle Requirements Room We’ve created a helpful guide to How Many Lumens You Need that walks you through this calculation in more detail. A 100 square-foot dining room, which needs 40 foot-candles, will require 4,000 lumens. For example, a 100 square-foot living room, which needs 20 foot-candles, will need 2,000 lumens.
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