Civinfo - View Single Post - Calculate the resistor you need for a LED

Stef · 8th March 2007, 22:33

The more LED's you can put in series the more efficient.
Also you are absolutly sure that each LED gets the exact same current.
But for white LED's the voltage drop is 3V or a bit more.
So if you put 4 LED's in series it would result in 12V, leaving no voltage to set the current through the resistor.

8th March 2007, 22:33	#10 (permalink)
Stef Supporter Triangular Exhaust Join Date: 14th October 2006 Location: Belgium Posts: 408 Thanks: 6 Thanked 9 Times in 6 Posts iTrader: (0)	The more LED's you can put in series the more efficient. Also you are absolutly sure that each LED gets the exact same current. But for white LED's the voltage drop is 3V or a bit more. So if you put 4 LED's in series it would result in 12V, leaving no voltage to set the current through the resistor.