replaces  Aprilaire Lamp 1910, 1930, 90, 87N77, 1076R, Aqua Ultraviolet 57 Watt, Lennox 87N77,  Purely UV Products PUVLF43H, Savio UVinex SUV057, Second Wind Air 1002KCS, 1076, 2000, 8000, 9000, four-pin, 48 watts and 436 mm in length, four-pin