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Phil-T4 · 18th February 2019, 06:50

You would need to know the forward voltage of the LED i.e. the voltage that it turns on and also the current rating in mA to drive it, different colour LED's has different forward voltages and current ratings.

Try this for starters... http://led.linear1.org/1led.wiz

18th February 2019, 06:50	#2
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	You would need to know the forward voltage of the LED i.e. the voltage that it turns on and also the current rating in mA to drive it, different colour LED's has different forward voltages and current ratings. Try this for starters... http://led.linear1.org/1led.wiz