1 lumen = how many k's???! URGENT!!

If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen.

The lumen can be thought of casually as a measure of the total "amount" of visible light emitted.
A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

http://en.wikipedia.org/wiki/Lumen_(unit)
 
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