light Conversion Calculator

The main light measurement units are: 1) Lumen (lm) - total light output, 2) Candela (cd) - light intensity in a direction, 3) Lux (lx) - illuminance or light falling on a surface, 4) Foot-candle (fc) - imperial unit of illuminance, 5) Nit (cd/m²) - luminance or screen brightness, 6) Watt (W) - radiometric power.

For LED lighting conversions: 1) Typical LED efficacy is 80-100 lumens per watt, 2) 800 lumens ≈ 8-10W LED ≈ 60W incandescent, 3) 1600 lumens ≈ 16-20W LED ≈ 100W incandescent, 4) For rough estimates, divide incandescent watts by 6 to get LED watts, 5) Always check manufacturer specifications as efficiency varies.

Lux and foot-candles are related by: 1) 1 foot-candle = 10.764 lux, 2) 1 lux = 0.0929 foot-candles, 3) Common levels: office lighting 300-500 lux (30-50 fc), 4) Sunlight 100,000+ lux (10,000+ fc), 5) For quick estimates, divide lux by 10 to get foot-candles.

Recommended light levels are: 1) Office work: 300-500 lux, 2) Detailed assembly: 500-1000 lux, 3) Corridors: 100-150 lux, 4) Home living areas: 150-300 lux, 5) Sports facilities: 300-750 lux, 6) Operating theaters: 10,000+ lux, 7) Emergency lighting: minimum 1 lux.