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Luminous efficacy is a measure of how effectively a mild source produces visible gentle. It's the ratio of luminous flux to energy, measured in lumens per watt in the International System of Units (SI). Relying on context, the facility might be both the radiant flux of the supply's output, or it can be the overall energy (electric power, EcoLight reviews chemical power, or others) consumed by the source. Which sense of the time period is meant must usually be inferred from the context, and is typically unclear. Not all wavelengths of mild are equally seen, EcoLight reviews or equally effective at stimulating human vision, due to the spectral sensitivity of the human eye