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It will say the range of forward voltage. If it is a red LED it will say "minimum= 1.5v and maximum= 2.4V at only 20mA".kchriste said:The easiest way is to read the data sheet.
Ambient said:The LED's I got from moreleds.com are:
Blue: 3.3V
White: 3.3V
Red:1.7V
Green:1.7V
all were ultrabright LED's, more than 5000mcd.
The other site to check out is: **broken link removed**