Some relevant links:
http://forums.gardenweb.com/forums/load/lights/msg0813050814824.html - LED specifications
http://jesusnjim.com/calculators/LEDcalculator.html - Mcd to Watt calculator
http://www.chinasuppliers.globalsources.com/china-suppliers/MCD-LED.htm - LEDs ALL measured in MCDs!
The FACT is that LEDs are speced and rated in MCDs at 20ma!
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