Ushio HPL-550/77V+, JS77V-550WC 550W/77V, tungsten halogen, HPL Lamp The High performance Ushio 1000668 HPL-550/77V+, JS77V-550WC, 300 Hours lamp has been redesigned to be the most powerful HPL ever. It's ultra-compact filament geometry now improves the optional efficiency of your ETC Source Four fixtures to produce up to 20% more fixture lumens. That's up to 20% more light from the same fixture as compared to the old lamp design. Features: - Abbreviation Name: HPL-550/77V+, JS77V-550WC, 300 Hour - Description 2: 550W 77v - Base: G9.5 2-Pin w/ Heat Sink - Bulb Type: Halogen Bulbs - Color Rendering Index (CRI): 100 - Color Temperature (K): 3250K - Diameter (in): 0.72 - Filament: 4-C8 - Lamp Finish: Clear - Luminous Flux (LM): 16170 - Maximum Overall Length (in): 4.09 - Light Center Length (mm): 60.3 - Rated Life (Hours): 300 - Shape: T6 - Voltage: 77V - Wattage: 550W Abbreviation NameHPL-550/77V+, JS77V-550WC, 300 Hour Description 2550W 77v BaseHT/SNK Bulb TypeHalogen Bulbs Color Rendering Index (CRI)100 Color Temperature (K)3250K Diameter (in)0.72 Filament4-C8 Lamp FinishClear Luminous Flux (LM)16170 Maximum Overall Length (in)4.09 Light Center Length (mm)60.3 Rated Life (Hours)300 ShapeT6 Voltage77V Wattage550W