Bulk LEDs

Umi_Ryuzuki · Post by **Umi_Ryuzuki** » Sat Dec 02, 2006 9:43 pm

Right now is the time to get LEDs.

There are several different strings of LED christmas lights in multicolor, and white LED set ups.

They are running about $7 bucks for 60-70 lamps.

8)

zaphod · Post by **zaphod** » Tue Dec 05, 2006 5:08 pm

Hey, is Ent'il Zog's treatise on Christmas LEDs still online? Umi, do you know the voltage drop and max current on these?
Zaphod

Umi_Ryuzuki · Post by **Umi_Ryuzuki** » Wed Dec 06, 2006 1:10 am

All the LED I have are rated at 4volts.

[edit]
While the packages say 4 volts, I built a power supply to run 4.05 volts, and,
it turns out, that 4 volt LEDs in christmas strings are not all 4 volts.

The White, Blue, and Green LED are 4volt.
The Yellow, Red, and Orange LED are 3 volt.

I burned out a few....

zaphod · Post by **zaphod** » Fri Dec 08, 2006 10:26 am

Ok cool, thanks for following up.
I guess the resistor is on the LEDs themselves. I'll just have to get some and play around with 'em, as you are.
Thanks again!

Umi_Ryuzuki · Post by **Umi_Ryuzuki** » Fri Dec 08, 2006 8:27 pm

Even at 3 volts from a voltage regulator I built popped the yellow, red and orange LED. They seem to need at least a 10 ohm - 12 ohm resistor.

Some pictures...