Replacement 5 Watt UV-C Lamp for the JBJ SUBMariner UV Sterilizer. The UV-C lamp has an average life span of 8,000 hours of operation (333 days). Although the lamp may illuminate after 8,000 hours, it will not perform effectively for disease control. The lamp should be replaced before it reaches 8,000 hours of operation. You can check the status of the lamp by an illuminated blue color at the bottom of the SUBMariner.