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Cold Light unit.

Posted by Stephen Eglinton  
avatar Re: Cold Light unit.
June 13, 2012 05:23PM

That's a path to the desktop folder on your PC. Interesting but not a lot of use smiling smiley If you can e-mail a copy privately to Gene, perhaps he would be so kind as to put it on his site and post a URL to it here?

It's an interesting thread. I've also pondered for a while on the (in)efficiency of coupling in my 150W halogen light box. I think it unlikely that the coupling can be more efficient than about 20% sad smiley If that's about right then the lower output LED approach should clearly deliver more payload onto the target.

Edited 1 time(s). Last edit at 06/13/2012 05:28PM by Owen Lewis (2).
avatar Re: Cold Light unit.
June 13, 2012 05:26PM
Plese delete.

Edited 1 time(s). Last edit at 06/13/2012 05:30PM by Owen Lewis (2).
Re: Cold Light unit.
June 13, 2012 07:34PM
Hi Steve,

I came across the problem of not getting enough light out of the IKEA LED lamps on an excursion. We sorted that by fixing a 10x lens in front of the lamp to focus the light more tightly. That worked really nicely and may be the cheapest option to illuminate micromounts. As we were on excursion we just used sticky tape - and we had a well focused light beam that enabled us to see tiny things with our old excursion microscope (that just sucks up light...).

Best Regards

avatar Re: Cold Light unit.
June 14, 2012 03:45AM 12 volt, wide even light, and a natural color, and bright as well. I made one into a headlamp and it is way better than any of my other ones. It is dimmable by reducing the voltage, and the light is cool.
Re: Cold Light unit.
November 29, 2012 06:09AM
I am using led-source fiber illuminator. My experience tells me that it can not introduce more light from a source like a light bulb to an optical fiber that the optical power that an area of the source (filament) equal to the area of the optical fiber core emits within the NA of the optical fiber. So, the best way to introduce light from a white source to a fiber is to put the fiber very near the fillament or (better) try to use a lens to produce a 1:1 image of the filament and put the fiber there.
avatar Re: Cold Light unit.
November 29, 2012 10:37AM
Why a 1:1 image? Given (say) a single 600um fibre core, ideally, would you not want all the light gathered and concentrated into a spot of not greater than 600um diameter at the fibre termination?

That said, some cold light gooseneck systems (like one of mine) do not transmit the light via a single fibre but rather through an approx 5-6mm bundle of such fibres.

None of the systems I use (QH(2) and Xenon arc (1)) utilises a lens system to improve the efficiency of light capture, using no more than elliptical(?) reflectors. Accordingly, all are quite lossy. They do the job though.

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