Replacement ultraviolet lamp for the Hanovia WS230 disinfection system. Medium-pressure UV lamps lose output steadily through life rather than failing outright, so they are replaced on elapsed running hours against the system’s dose record, not when they stop lighting. Order against the system model, and renew the quartz sleeve seals at the same visit — the sleeve has to be disturbed to change the lamp and those seals are single-use. Reference number 2243-0707.