White from multiple colors - Think Geek

I've been looking for a battery powered flashlight that I can use to demonstrate how colors combine to make all colors from 3 LEDs.

Now... I see that Think Geek has one.



Here is the link to their site:

http://www.thinkgeek.com/gadgets/lights/8db4/

And to a review that I found:

http://www.geardiary.com/2007/01/15/the-multi-color-led-flashlight-review/

Has anybody got one of these? How good is the "white"?

Here is a previous thread where I was looking for such a light:

https://www.candlepowerforums.com/threads/158087&highlight=multiple+colors

After a little more searching...
I found this CPF discussion of the light:
https://www.candlepowerforums.com/threads/186719&highlight=thinkgeek

They've been unavailable at think geek for almost 2 years now.
I found one cheaper at another online store a long while back. It's a cheap piece of junk in my opinion. It has one of those notoriously terrible reverse clickies that only works some times. It also unfortunately is a 3x AAA with battery holder deal so the runtime is really bad as well.

Beyond that it does make colors and compared to some of the things I've bought around here is cheap enough to grab one if you can justify it as a learning tool to demonstrate RGB lighting.
It has 3 generic LEDs supposedly capable of 1W each under a bit of a diffuser then set behind a semi-aspheric plastic optic that spreads the beam out into an even flood. The side clicke chnages colors and cycles thru a couple different modes. No problems with that yet.

If you have anyother questions I'd be happy to answer them.

interesting...
What emitter does that one use? According to the review its ONE giant emitter:huh:

A quote from that review...

The big surprise is that it appears to be one really big LED and not 10 different colored LED's or even 5 dual color LED's. This is an amazing thing, as in all my years working with electronics, I have never seen such a big LED nor one that can produce so many colors.

Click to expand...

That said the reviewer has no clue.


It is three separate emiters mounted relatively close together behind some sort of diffuser. The diffuser minimizes color shadows somwhat but they are still aparent if you're looking for them.


Also another thing to put into the negative side of the light is that it has an annoying PWM/flicker roughly in the 100hz range by my guess that is on constantly in every mode.

PhantomPhoton said:

It's a cheap piece of junk in my opinion.

Click to expand...

Would you like to unload it? For the right price... I will buy it!