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Ring light for microscope

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artag:
I've got a Wild M3Z stereo microscope fitted with a Volpi fibre optic ring light.
It's a great microscope and the ring light is pretty good, but maybe the hot noisy light / fan is past it's best.

I could put an LED MR16 lamp in and maybe feather the fan a bit for lower noise. I've tried a 3.4W MR16 but it's not bright enough. I'm about to try a 7W. I can even still get stock of the original 50W halogen.

But should I lose the fibre optic ring light and get an LED one ? How do they compare ? Most seem to be rather cheaply made but it's an inherently cheaper thing to make. I can probably find a decent quality one if I look far enough.

Zero999:
An LED replacement halogen light might overheat, although the fan should help and a colleague did replace a halogen in his fibre optic Christmas tree and hasn't had any problems with it.

An LED ring light would be more efficient. Lots of power will be lost in the fibre optic system.

jfiresto:
The white-ish LED lamp substitutes I have tried, have excited an annoying amount of lateral chromatic aberration, presumably, from their strong peak in the blue. Have you found a LED with a less peaky, broad spectrum?

Do you have an M3Z Type S? I think that model is practically perfect.

Zero999:

--- Quote from: jfiresto on April 21, 2024, 06:02:47 am ---The white-ish LED lamp substitutes I have tried, have excited an annoying amount of lateral chromatic aberration, presumably, from their strong peak in the blue. Have you found a LED with a less peaky, broad spectrum?

Do you have an M3Z Type S? I think that model is practically perfect.

--- End quote ---
Does it matter for this application? Quite often, colour rendering is unimportant. I don't care about colour rendering, when I'm soldering, or inspecting a PCB.

jfiresto:
At high magnifications, I see enough Latitudinal CA (yellow and violet fringing) to obscure the edges of shiny solder pads. It is a much bigger issue for a camera which can not sum the left and right images. As the vision is part perception and part imagination, the LCA could be psychosomatic – some are more sensitive to it than others.

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