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This is a Westcott Fluorescent Five Pack of Edison base screw-in bulbs for the Westcott Spiderlite TD5 fixture. It consists of four 50 watt and one 20 watt fluorescent bulb (for the center). They are all daylight balanced, long-life, flicker-free bulbs.
Combine four of these 50 watt lamps and the one 20 watt lamp in the Spiderlite TD5 and obtain the tungsten equivalent of over 900 watts of power.
AMR Reading = ISO 400 @ 3' = f/5.6 (when used with 24 x 32" softbox @ 1/60th sec)
High Color Rendering Index
Rated to 93+ CRI
In the Box
Westcott Fluorescent Lamp Five Pack - 4x50, 1x20 Watts/120 Volts