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This is a Westcott 50 Watt/120 Volt Fluorescent, Edison base screw-in bulb, for the Westcott Spiderlite TD5, SP Systems Cool Light, Interfit, Impact, Bowens Tri-Lite, or any other floodlight fixture that can accept a large floodlight bulb. 5500° Kelvin.
Combine four of these lamps and one 20 watt lamp in the Spiderlite TD5 and obtain the tungsten equivalent of over 900 watts of power.