It's measured as the number of lumens produced divided by the rate of electricity consumption (lumens per watt).
Light Quality
Color temperature The color of the light source.
For red, amber, yellow, green and blue LEDs, new materials have been developed that are more efficient than traditional materials, producing efficacies (lumens per watt) greater than incandescent lamps and rivaling fluorescent lamps.
Lumens per watt, which indicates how much light is produced for the energy used. This measurement shows how efficientl the different types of lamps are.
3.
that are long lasting and require little maintenance, and offers six steps for designing lighting systems that use half the energy of earlier conventional designs. Several light sources and systems are listed along with their mean lumens per watt, ...
 See also: Lumens, Light, Lighting, Energy, Incandescent
  
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