Summary: Calculating Total Lumens Needed for a Room Let’s recap how to gauge how much light you need for a space. Multiply your room square footage by the footcandle requirement. For example, a 100-square foot living room, which needs 20 foot candles, will need 2,000 lume...
9-watt Compact Fluorescent Lamp = 450 lumens So to clarify, generally, total light output from a light source, regardless of the direction the light travels, is specified inlumens(lm). So can I just find a handy lumen comparison chart to see how many lamps I need for my studio space?