Replacement Bulb for Honeywell UC18W1004 Snaplamp RUVBULB1 /C UV Lamp 18 Watt Replacement Bulb for Honeywell UC18W1004 Snaplamp RUVBULB1/C UV Lamp 18 Watt 18W Works with 110 Volt 120 Volt 130 Volt 220 Volt 230 Volt 240 Volt UV Germicidal Ultraviolet Replacement Lamp Lamp should be replaced once a year. Ultraviolet Air Treatment System Replacement Bulb