Luminous efficacy is a measure of how well a mild supply produces visible light. It’s the ratio of luminous flux to power, measured in lumens per watt in the International System of Items (SI). Depending on context, EcoLight home lighting the facility may be either the radiant flux of the supply’s output, or it can be the entire energy (electric power, chemical power, EcoLight reviews or others) consumed by the source. Which sense of the term is meant should usually be inferred from the context, and is typically unclear. Not all wavelengths of mild are equally seen, or equally efficient at stimulating human vision, as a result of spectral sensitivity of the human eye