575W/120V tungsten halogen HPL series Ultra Compact Filament (UCF) HPL lamps are a group of stage & studio and architectural lamps and have been specifically engineered 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 54817 is a HPL 575 that runs on 120V and is a member of OSRAM s UCF (ultra compact filament series. UCF lamps feature compact filament design that improves light collection light output and efficiency. Manufacturer OSRAM Part Number 54817 UPC 046135548178 EAN 4052899542068 Abbreviation Name HPL575/120 Base G9.5 2-Pin w/ Heat Sink Bulb Type Halogen Bulbs Color Rendering Index (CRI) 100 Color Temperature (K) 3265K Diameter (in) 0.741 Filament 4-C8 Lamp Finish Clear Luminous Flux (LM) 16460 Maximum Overall Length (in) 3.822 Rated Life (Hours) 300 Shape T6 Voltage (V) 120V Wattage (W) 575W