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Thanks for the replies. Iam looking for the latter-continous use bright lite for engraving under a large binocular microscope with a working distance of about 6-8 inches. I would also use it for digital macro photography so would like a pot for adjusting intensity.thanks for your help
I read with intrest the article in the last issue of NandV re;ring flash for macrophotragraphy. Iwould like to build one but one that would run continually for microscope work. Being a rank amature, I need to know how to wire the leds, (I want to use 12), in series or parallel, resister values, do I...