This is an excellent UV light bulb. It can be widely used for aquarium fish tank sterilizer, germicidal and air cleaner as replacement bulbs. Features: Excellent quality, highly cost effective. Replacement bulbs for UV sterilizer or air cleaner. Help to sterilize and keep a healthy environment for fish tank. Test We Passed: Our product has passed test of CE and ROHS. Note: This UV sterilizer light bulb is used with electronic ballast, please don't use it with alternating current(AC), or it will burn out. Specifications: Type: H Type Tube Material: Quartz Glass Tube Rated Voltage: 120-220V Wave Length: 254 Rated Power: 9W Base Type: G23 Chroma: 254/185 Product Size: 16.3 * 3.2cm / 6.42 * 1.26"(L * W) Product Weight: 27.5g / 0.97oz(Each) Package Included: 2 * Light Bulbs