Calculates the number of light bulbs needed to adequately illuminate a room based on its dimensions, desired light level, and bulb specifications.
Start with your values, or try a preset.
Enter Room Length (feet), Room Width (feet), Room Height (feet), Desired Light Level (Foot Candles), Lumens per Bulb, and Light Loss Factor in the units shown.
Read Room Area, Total Lumens Needed, and Number of Bulbs Needed in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Room Length (feet): 12 ft; Room Width (feet): 10 ft; Room Height (feet): 8 ft; Desired Light Level (Foot Candles): 10 (Bedroom); Lumens per Bulb: 800 lm; Light Loss Factor: 0.7
Room Area: 120 sq ft; Total Lumens Needed: 1,714.285714 lm; Number of Bulbs Needed: 3 bulbs
Room Length (feet): 18 ft; Room Width (feet): 15 ft; Room Height (feet): 9 ft; Desired Light Level (Foot Candles): 20 (Living Room); Lumens per Bulb: 1,000 lm; Light Loss Factor: 0.7
Room Area: 270 sq ft; Total Lumens Needed: 7,714.285714 lm; Number of Bulbs Needed: 8 bulbs
Room Length (feet): 15 ft; Room Width (feet): 12 ft; Room Height (feet): 9 ft; Desired Light Level (Foot Candles): 30 (Kitchen); Lumens per Bulb: 1,200 lm; Light Loss Factor: 0.7
Room Area: 180 sq ft; Total Lumens Needed: 7,714.285714 lm; Number of Bulbs Needed: 7 bulbs
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