Lighting Calculators
Choose a calculation for your next lighting decision. Each tool shows its inputs, assumptions and limits.
Luminaire quantity
How many fixtures might the space need?
Area · maintained illuminance · luminaire lumens · utilance · maintenance factor
Energy & payback
What changes when you replace one luminaire with another?
Lumens and watts · operating schedule · electricity tariff · investment
Beam coverage
How wide is the nominal beam at the target plane?
Full beam angle · distance to plane · metres or feet
Check the specifications first
Watts, lumens and lux answer different questions. Use the lighting specifications reference for definitions, comparison checks and a lux / foot-candle converter.
These tools support preliminary comparisons. Final fixture selection and layout require project-specific photometry, operating conditions and applicable requirements.