Most current, professional flash heads and monolights are equipped with user replaceable flashtubes that may simply be plugged into, and unplugged from their sockets. With proper handling, these flashtubes may last for tens of thousands of flashes under normal use.
This flashtube is UV-Coated, or UV-Corrected. UV flashtubes have a yellow appearance, and they counteract the excess blue 5700° or higher output of non-UV coated flashtubes. UV Coating lowers the color temperature to 5500°, which is the color of noon daylight on a clear day.
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Comments about Quantum Instruments QF32UV UV Flashtube:
puts out a very nice light, but why is this thing so expensive? Similar bulbs by lumedyne sell for $67..
I purchased it so the output would match 580ex speedlight color (the non uv coated bulb is roughly 200k too warm to match speedlights, but I am sure either bulb will give good results).
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