Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the sources output, or it can be the total power (electric power, chemical energy, or others) consumed by the source.A WShop 40% off Coupon is gotton from the Coupon Machine and you can use it to get 40% off any one item at the WShop. A WShop 40% off Coupon is gotton from the Coupon Machine and you can use it to get 40% off any one item at the WShop. FANDOM. Games Movies TV Video. Wikis. Explore Wikis; Community Central; Start a Wiki ...
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