T5 style quartz glass ultraviolet sterilizer lamp fits 40 and 80 Watt Emperor Aquatics Smart UV Sterilizer models #02040, #02240, #02240B, #02240S, #02080, #02280, #02280S and 03140. 80 Watt models require two (2) forty watt lamps. They offer over 12 months of continual service until they reach their 60% efficiency, at which point, they should be replaced.