04-26-2008, 07:35 PM
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Originally Posted by Busgod
don't have box or bulb looked on line can't find out lumens for it yhe only thing I found was 7100k rating 65watt but no lumens.
A handheld photographic light meter would tell you the differences in lumens. Light meters read in foot candles, so one foot candle per square foot is the same as one lumen per square foot. You hold the light meter about six feet from the light source to get an accurate reading. Say your meter says 10 foot candles (lumens). To find out what the output is at the source is simple multiplication - X, in this case 10, x6x6 - to see how 'bright' your lights are.
Be best if you did your lumen test in a dark room with just the lights. Florescences put out light in a sort of spherical form, like the sun does, and a light meter can measure that light no problem.
I've been a pro photographer for many, many years and measuring lumens is a big part of the game.