Red, Yellow, Green and Orange Led's works on 1.8 to 2 volts, White, Blue and
Purple need 3 to 3.5 volts for proper operation. All 2mm LED's operate on
20ma except 2mm Flashing that work on 10 ma, A current limiting resistor
should be used when lighting LED's in most applications. To find the correct
resistor subtract led working voltage from your source voltage then divide
by .02 for 20ma and .01 for 10ma, use a resistor equal to that amount
or greater, do not use a smaller resistor. If there are any questions we are
always more than willing to help if possible.