PRODUCT FEATURE: A 36 or 60 bright white LED bulb ring light kit for microscopes. The kit includes a 36/60-LEDs ring light with 2-3/8" (60mm) inner diameter, a 58-264V power adapter. With variable intensity control, it provides cool, even, intense and focused shadow-free illumination. It is an ideal durable cool light source for microscopes. PRODUCT SPECIFICATIONS 1,36/60 bright white LED bulbs. 2,20,000 hours of life. 3, Cool, even, Intense and focused shadow-free illumination. 4, Variable intensity control. 5, Optimum light range:2-3/8" - 5-1/2" (60 to 140mm). 6, Power input:58-264V,50-60HZ, auto switching. 7, Fits 35-59mm mount rings.