575 watt, tungsten halogen, HPL series, long life, Ultra Compact Filament (UCF) (HPL lamps) are a family of stage & studio and architectural light sources and have been designed to work with ETC Source Four fixtures. Though HPL lamps are available in various wattages and voltages they all feature G9.5 medium 2-pin bases with heat sinks. Osram 54807 is a HPL 575 that runs on 115V and is a member of Osram’s Long Life series, giving it a life hour rating of 2,000 hours. In addition, this lamp features UCF (ultra compact filament) technology, giving the lamp improved light collection and efficiency.