Lamp Number H33GL-400/DX Bulb E-37 Base Mogul (E39) Common Code HR400DX33 Watts 400 Bulb E-37 Base Mogul (E39) ANSI Ballast H33 Coating Deluxe White Burning Position Universal Approx Initial Lumens 23000 Approx Mean Lumens 19100 Average Life 24000 MOL in/mm 11.50/292.1 LCL in/mm 7.00/178.0 Color Temperature 3700 Color Rendering Index 45