The SYLVANIA ULTRA HE T8 LED lamps and retrofit kits are an energysaving and longer-life alternative to replace traditional fluorescent T12 or T8 lamps. Compared to traditional fluorescent lamps, ULTRA HE T8LED lamps offer higher efficacy and equivalent light output. Lamp requires dedicated external driver and non-shunted G13 medium bi-pin lamp holders. For retrofit application, lamps and drivers are offered together as 1-lamp, 2-lamp and 3-lamp retrofit kits