![]() ![]() Luminous flux is often used as an objective measure of the useful light emitted by a light source and is typically reported on the packaging for light bulbs, although it is not always prominent. The lumen (symbol: lm) is the SI derived unit of luminous flux The lumen is the standard unit of luminous flux. Lumens are denoted by lm are a measure of the total amount of visible light to the human eye from a light source or lamp. Luminous flux is the quantity of the energy of the light emitted per second in all directions. The SI unit of luminous flux is the lumen (1m). In other words, it is photometrically weighted radiant flux (power). ![]() It differs from the measure of the total power of light emitted, termed ‘ radiant flux‘ in that the former takes into account the varying sensitivity of the human eye to different wavelengths of light. Luminous flux, or luminous power, is the measure of the perceived power of light. ![]()
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