Calculate how many fixtures or bulbs are needed to hit a target light level (foot-candles) in a room.
Fixtures Needed
— fixtures
Rounded up.Usage Tip
Spread fixtures evenly and add dimming; it is easier to dim ample light than to live with too little.
THE MATH
total lumens = area × foot-candles
fixtures = round up( total lumens ÷ lumens per fixture )
fixtures = round up( total lumens ÷ lumens per fixture )
Light level is measured in foot-candles. The total lumens a room needs is its area times the target foot-candles, and fixture count is that total divided by one fixture output.
Enter the room area, the target foot-candles for the use, and the lumens per fixture from the bulb spec.
The result rounds up to whole fixtures.
The result rounds up to whole fixtures.