144 bright white LED bulbs; brightness is adjustable from 0% to 100% for brightness when needed. Intense, focused, shadow illumination with variable intensity control; power input 100240V, 5060Hz. Suitable for lens diameters of 30mm to 63mm; provides an optimum amount of light to a microscope or camera when additional light sources are required or lighting is insufficient. Our microscope accessories are made of quality materials to ensure durability and stability for longterm use. Use scenario: Attach to a microscope with a 3063mm lens diameter and adjust brightness to achieve even, shadow illumination of slides and specimens. Use scenario: Use as an external light source for macro photography or camera work to enhance detail and color accuracy in closeups. Use scenario: Conduct electronics or component inspection with bright, adjustable lighting to reveal fine features and reduce glare.