Ster-L-Ray U-Shaped Slimline Ultraviolet Germicidal Lamps are instant starting and utilize a coil filament on each end which operates hot. Lamp life is governed by the life of the electrodes and is affected by the frequency of starting. Slimline germicidal lamps are well suited to applications requiring high ultraviolet intensity such as water sterilization, air purification in duct systems and conveyorized product disinfection.