UV-C bulb lasts 5000 hours depending on use for long-term sanitizing. Replacement for Hunter 30850 Small UVC Air Purifier Replacement Light Bulb. Package contains 1 replacement bulb. Improve the air quality in your living space with the H-B247 UV-C Air Purifier Replacement Light Bulb. This compact bulb provides long-lasting air purification and serves as a dependable replacement for the Hunter 30850 and H-B247 UV-C bulb. Simply install this replacement bulb in your compatible air purifier for a cleaner and healthier indoor environment. Compatible with Hunter HP247AP UV-C Plug-In Air Sanitizers.