how to measure the luminance of an LED using a photometer or an light meter?

May 30, 2006 4:55am CST
we are interested in measuring the luminance of a 5mm LED for project purposes, how to go about it ? that is should we place the LED right over the probe and take readings or should we keep LED's at particular distance and then measure? we got a value of 3500 FL. ,for them which i beleive is very high comparitively. please help me out!!!!11
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