What's Luminous Flux

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Lumen is the units of luminous flux. Luminous intensity of 1 candela (cd) of the point source, in the unit solid angle (one steradian) emitted luminous flux within the "1 lm" abbreviation (lm).

Name Definition

The so-called lumen simple terms, this means the candle a candle in one meter outside the brightness of the show as a normal 40-watt incandescent bulbs, the luminous efficiency is about 10 lumens per watt, so you can send 400 lumens of light. 220-volt 40-watt incandescent lamp, the luminous flux of 340 lumens. Flux per unit time is to describe the visual response to light radiation capacity of the strength of the unit is the lumen, also called brightness. Projector unit that is ANSI lumens luminous flux, ANSI lumens is the American National Standards Institute to develop standards for measuring luminous flux projector, it measures the screen, "field"-shaped intersection of nine points on the illumination, multiplied by the area, and then find nine point average, is the projector's ANSI lumens. The higher the lumens the brighter, the higher the brightness is not required when the projector lights. ANSI as American National Standards Institute (American National Standards Institute) abbreviation.