This is a 6 volt 20 watt halogen bulb for microscopes. Watt: 20w Voltage: 6v Type: Halogen Manufactured under ISO 9001 Quality Control Standards Brand: AmScope Model: BH-6V20W Materials: Metal, glass, plastic Dimensions: 3 inches long x 1 inch wide x 1 inch high Weight: 0.08 Pounds Color: Clear. Material: Aluminum.