|Uso||Luminous Efficacy of Radiation (LER)|
|Categoria||GT3 . Parâmetros cromáticos|
The luminous efficacy of radiation (LER) of a light source is a key metric for energy savings. Together with the efficiency with which light is generated, there exists a spectrally imposed limit assessed by the LER. Two major lighting metrics, the LER for energy savings, and the color rendering index (CRI or Ra) for illumination quality, are the critical criteria to be considered when developing new lighting sources. The energy efficiency of lighting is assessed by luminous efficacy (LE), measured in lumens per watt, which is the product of the LER (lm/W) and the energy efficiency ηe, so that LE=LER·ηe.
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