From the Manufacturer GE 21025 300-Watt PS35 . Bulb Diameter (DIA) [Nom]: 4.375 in, Bulb Finish: Clear, Bulb Material: Soft glass, Filament: C-9, Initial Lumens [Nom]: 5,820.00, Light Center Length (LCL): 7.000 in, Manufacturing Source: 6140, Maximum Overall Length (MOL): 9.3700 in, Nominal Initial Lumens per Watt: 19, Product Technology: Incandescent, Rated Life [Nom]: 1,000-Hours, Voltage [Nom]: 130, Wattage: 300GE incandescent lamps represents the state of the art of lamps for residential and commercial use, as well as special purpose lamps for decorative or display applications. In an incandescent lamp, light is generated by heating the filament to incandescence. The hotter the filament, the more efficient it is in converting electricity to light. However, when the filament operates hotter, its life is shortened so the design of each lamp is a balance between efficiency and life. This is why lamps of equal wattage may have different lumen ratings and different life ratings. Incandescent lamps of similar size are commonly available with different wattage ratings. The fixture wattage limit should not be exceeded.
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