Halo Lighting
US EPA Regulations
SAE
ECE
Useful Life
Total Life
Halogen
Efficacy
Lumens
Kelvin
Xenon
HID (Xenon) Bulbs
HID
Ballast
Burner and Ballast Operation
Burner Types
HID Color Temperature
History of HID
Advantages Of HID
LED Bulbs
LED Technical Information
History of LED
Gallium Arsenide
Physics
Lifetime and Failure
Future Application
LED
Efficiency of LED
How To Install Resistors For LED Bulbs
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Efficacy
In lighting design, "efficacy" refers to the amount of light (luminous flux) produced by a lamp (a light bulb or other light source), usually measured in lumens, as a ratio of the amount of power consumed to produce it, usually measured in watts. This is not to be confused with efficiency which is always a dimensionless ratio of output divided by input which for lighting relates to the watts of visible power as a fraction of the power consumed in watts. The visible power can be approximated by the area under the Planck curve between 300 nm and 700 nm for a blackbody at the temperature of the filament as a ratio of the total power under the blackbody curve. Efficiency values for light from a heat source are typically less than two percent. |
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