Luminous flux refers to the energy that the light source radiates from the surrounding space per unit time, which can cause the visual response energy, that is, the visible light. It describes the effective radiation value of the light source in units of 1 m (lumen).
The luminous flux of lamps of the same power may be completely different because of their different light effects. For example, the general lighting bulb is only 101m / watt, while the metal halide lamp can reach 801m / watt.
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