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Luminous efficacy is a measure of how well a light supply produces visible mild. It's the ratio of luminous flux to power, measured in lumens per watt within the International System of Units (SI). Relying on context, the ability will be either the radiant flux of the source's output, or it can be the total energy (electric power, chemical power, or others) consumed by the source. Which sense of the term is meant should usually be inferred from the context, and EcoLight LED is typically unclear. Not all wavelengths of mild are equally seen, or equally effective at stimulating human imaginative and prescient, because of the spectral sensitivity of the human eye