Quick Reference |
▪ Watt: a measure of the total power output of a light source |
▪ Lumen: a measure of the total visible light output of a light source |
▪ Candlepower: an obsolete term that has been replaced by “candela” |
▪ Candela: a measure of the intensity of a light source in a particular direction |
▪ Foot-candles and lux: the amount of visible light falling on a surface |
Watts & Lumens |
It is a common misconception that higher wattage equals higher light output—in part due to the fact that incandescent light output generally increases with wattage numbers. |
With LED technology, this is not the case. LEDs can emit the same, if not more light than a bulb, while consuming less power. |
Watts are a measure of power consumption, while lumens are a measurement of visible light output. |
When you want to know how bright a light will be, you need to identify the lumen output value, not the wattage—especially when comparing LED and bulb-based lights. |
Foot-Candles & Lux |
Both foot-candles and lux measure the same thing—the amount of visible light that falls on a surface. The difference is that the foot-candle uses the Imperial standard measuring system (feet, pounds, etc.), while the lux uses the metric system (meters, grams, etc.). A single foot-candle is equivalent to the amount of light that falls on a surface that is one foot away from a single candle, and a lux is the amount of light that falls on a surface one meter away from a candle. For conversion, one foot-candle is approximately equal to 10.764 lux. |
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