Yeah, I found this out the hard way years ago when using my Point Light Source. I have it on a voltage regulator but the light is so bright that I wanted to dim the light and increase the exposure times. But by dimming the output from the bulb, it changed the color dramatically -- just look at any incandescent bulb on a standard dimmer switch. It's like exposing paper to a 100W light bulb versus a candle flame. My exposures were perfect -- thanks to my trusty Minolta Autometer II -- but the contrast changed dramatically. It took me a couple of minutes to figure out the problem, and that's when I switched to ND filters for longer exposures (you use a Point Light Source wide open).
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