Another LED Question
Thread Starter
TECH Addict
iTrader: (14)
Joined: Mar 2005
Posts: 2,130
Likes: 0
From: League City, TX
Another LED Question 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.
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.
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
Sorry for the non-useful post...lol
Joshua
Thread Starter
TECH Addict
iTrader: (14)
Joined: Mar 2005
Posts: 2,130
Likes: 0
From: League City, TX
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.
