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"Putting a dimmer from Home Depot on a light--any light--and turning it down will alter the color temperature. This is why photographic lights with dimmers are so expensive. They have the capability of lowering the output without effecting the color
temperature."
All dimmers will change the colour temp, they may also cause a (singing) noise.
Colour temp may also be different depending on the manufacturer and the wattage of the bulbs. I've seen references showing the work light halogens to vary from 2800 to 3100 K. The lower temp lamps also seem to have a lot longer life.
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