Coban

iTrader: (14)

I'm making an array that will replace on of the bulbs in my truck.

If I use 14V for the resistor calculation with 4 LEDs in a series:

(14-3.4-3.4-3.4-3.4)/.02=20 Ohm Resistor

What happens when I run 12V through it? (Total voltage drop =13.6) Will it not run at all? I could use 3 series, but its more efficient with 4. I think 20 ohm resistors are available too.

I dont know if I should use 12V or 14V for my voltage and I dont want these things to burn up.

warscout2

they just wont be as bright

kraaazymike

iTrader: (2)

+1. Theyll run on 12 just fine.

joshua32

iTrader: (20)

What kind of leds are those and where did you get them...don't post the link though. Looks awesome. I did a similar project in my truck...I used 45 5mm 18000mcd (iirc) leds and ran them in series of 3. It was a major pain in the *** but it was my first project and I am not as well educated in the whole resistor/led thing.

Sorry for the non-useful post...lol

Joshua

Coban

iTrader: (14)

They are new (to me) high flux LEDs. They have 4 leads vs the normal 2. The great thing about them is that they have 120 degree projection angle. I got them off ebay and I think they are about 15000mcd. The dome light has 24 LEDs and the map lights have 9 LEDs each.