led's

Darthness · Post by **Darthness** » Sat Apr 22, 2006 9:28 am

maybe yoiu can help me... i want to do a LED dome light for my car. im probably going to go out and buy the LEDs and stuff today.e do i need to buy one of those boards like you used with the tail lights?

joeyc · Post by **joeyc** » Sat Apr 22, 2006 11:00 am

is it necessary to have a resistor when using 2 aaa to supply like 5 or so? forward voltage is 2.4. it says to use a 33 ohm, but is it really necessary?

Darthness · Post by **Darthness** » Sat Apr 22, 2006 11:30 am

I ordered 20 super bright green LEDs w/resisotr and i bought a DMM today. i want to use some of these in a domelight for my car...

Post by **GlassWolf** » Sat Apr 22, 2006 1:17 pm

joeyc wrote:is it necessary to have a resistor when using 2 aaa to supply like 5 or so? forward voltage is 2.4. it says to use a 33 ohm, but is it really necessary?

the resistor controls current.

Sat Apr 22, 2006 2:54 pm

Darthness wrote:maybe yoiu can help me... i want to do a LED dome light for my car. im probably going to go out and buy the LEDs and stuff today.e do i need to buy one of those boards like you used with the tail lights?

Ya, that will be the easiest way to do it. Just cut it to the size you need, and then solder in all your resistors. Just make sure you get the polarity of the LEDs right, other wise it won't light up :)

Sat Apr 22, 2006 2:55 pm

joeyc wrote:is it necessary to have a resistor when using 2 aaa to supply like 5 or so? forward voltage is 2.4. it says to use a 33 ohm, but is it really necessary?

Yes as Kiki said it controls the current, otherwise you could blow out your LEDs really quick.

Justin from Detroit1 · Sat Apr 22, 2006 3:30 pm

I get all mine from Oznium.com. Great service and great product.

Bwcad1 · Post by **Bwcad1** » Sat Apr 22, 2006 3:46 pm

there a lil expensive per led i think a 1.39 or 1.5 per is a lil high... when you can make them for like 10 c

joeyc · Post by **joeyc** » Sat Apr 22, 2006 4:27 pm

Justin from Detroit wrote:I get all mine from Oznium.com. Great service and great product.

yeah, just bought some from there, BUT they don't have as wide of variety as some others. But they are definitely competitively priced!! do the uv's work pretty good? OH and how well does filing or cutting the top of the led effect the dispersion of light?

Sat Apr 22, 2006 5:38 pm

joeyc wrote:yeah, just bought some from there, BUT they don't have as wide of variety as some others. But they are definitely competitively priced!! do the uv's work pretty good? OH and how well does filing or cutting the top of the led effect the dispersion of light?

I've never done either before, but I would think it would affect the viewing angle some.