This is a microscope ring light. Add 28 5 mm LEDs (Nichia NSPW500GS-K1 for example) and current regulators. I used LM317 based CC sources with 5-6 LEDs connected in series. 24V power supply. Fits a 50 mm microscope barrel.
This is actually just an example - design your own based on this idea.
cm:
7.722 w x
1.928 d x
8.798 h
in:
3.04 w x
0.759 d x
3.464 h
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$ United States
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