Color Changing LED

StayInTheLight · Jan 16, 2004

Hello,

Does anyone here know of an LED that can change colors. I read about an LED like this in Popular Science this month, but the short paragraph on the topic didn't reveal any other details.

I'd be interested in an LED that can shine both white and red.

Thanks
StayInTheLight

Hoghead · Jan 16, 2004

The ARC AAA RGB (Red/Green/Blue) might be what your thinking of.
http://store.yahoo.com/flashlight/arcrgb.html

StayInTheLight · Jan 16, 2004

It looks like the ARC AAA RGB only flashes those colors. I'd be interested to see a flashlight that you can select white and then select red. White for general task lighting and red for preserving night-sight and power.

p.s. ... it'd be even better if it were a AA battery flashlight /ubbthreads/images/graemlins/smile.gif

Kiessling · Jan 16, 2004

There are the dual-color Eternalights which have 2xwhite and 2xred/green LEDs and run on 3xAA.
Then you can get the SF A2 ... a regulated incan paired with 3xLED (color of choice), but it runs of 2x123.
bernhard

jtice · Jan 16, 2004

They make RGB leds that have 4 leads. 1 neg. 3 pos.
Then you can select which color you want to use.

StayInTheLight · Jan 16, 2004

Does anyone here know of a color changing flashlight that uses 1 LED?

Threepio · Jan 16, 2004

This one has two of each color, red and white. It's called the Skylite 2, here's a couple links to look at... --Bob

http://www.company7.com/rigel/products/skylite.html

http://www.flashlightavenue.com/rigel.html

StayInTheLight · Jan 16, 2004

Thanks for all the suggestions. But I don't think I was being clear when I was asking my last question.

I was wondering if there was a flashlight out there that uses only 1 color changing LED bulb.

StayInTheLight · Jan 16, 2004

Here's the little paragraph that I read in Popular Science

07.15.2003 Bright idea
Quantum dots, nanoscopic particles of semiconductor prized for there light-emiting and color-tuning properties (merely changing the particle size alters the color of light emitted), are used for the first time in a white-light LED.

StayInTheLight · Jan 17, 2004

So the only flashlights out there that use 1 color changing LED buld are rave lights?

LEDependent · Jan 17, 2004

First of all, that LED in the PS article is prototype, not production. Secondly, LED's that can change color are made up of R, G, and B diodes. None that I have seen are just RED and WHITE. You would have to rig up something that would switch between 100% Red and the right combination of all three colors to get white. The rave lights use those LEDs, as does the ARC RGB.

LED-FX · Jan 17, 2004

Problem with RGB 5m LEDs is that each chip focuses its light in a different direction.

Quantum dots are something Sandia , probably among others are working on:

http://www.sandia.gov/news-center/news-releases/2003/elect-semi-sensors/quantum.html

Adam

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