This is a 56-LED ring light with built-in intensity control and mounting size up to 2-3/8" (60mm) in diameter. The ring light has 2-3/8" (60mm) inside and 4" (100mm) outside diameters. It works with power supplies from 220V to 240V. It comes with a 1-7/8" (48mm in diameter) ring adapter. With variable intensity control, it provides cool,
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excellent
very useful and convenient ring light. we replaced the ring light that originally came with the microscope because it was bulky and noisy...