Lumens to Candlepower ConversionĬandlepower is a unit of measurement for luminous intensity. If you have especially dark-colored walls and furniture or if you’re using light fixtures with shades, you’ll need roughly an additional 10 lumens per square foot. Once you determine your desired footcandle level, you multiply that by your room’s square footage. 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. Multiply the room square footage by the footcandle requirement. Once you establish the intended use of your space, browse this footcandle chart for the IES-recommended footcandle requirement for your application. For example, a bathroom or kitchen will require more footcandles than a living room or bedroom. Lighting requirements vary depending on the type of room being lit, also known as the application.
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