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  1. Interesting light bulb facts... lumes - LUX ext...

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    Lumen: A unit of measurement of the total flow of light which is emitted continually from a source. One lumen is equal to the flow of light which is emitted from a very small wax candle. The common 40 Watt incandescent bulb emits some 400 lm (lumen). So the efficiency of that bulb is...
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