American Ultraviolet GML180, Aquanetics ALA-4, Q4IL, Q4SPT, Aqua-Star Portable Water Purifier, EcoQuest Fresh Air UV4, General Electric 15872, G4T5, Hawaiian Marine AN-4S, AN-4SA, OSRAM SYLVANIA G4T5, Purely UV Products PUVLB504 The lamp is 4 watts, 135 mm in length and has single on both ends, rated effective life 10,000 hrs., change once a year.

 SIEMENS