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If you decrease the voltage the color temperature will change (lower temp.). This happens in everyday use because the voltage rises and falls as the power company changes the line voltage to meet demand etc. Color temperature will also change as the bulb ages. Color temperature changes with daylight all the time. White balance to your light source and you'll be fine. Troubles come in when you want to apply filters. The change in color temp. may produce unexpected results. There are meters to measure color temperature, but they are fairly expensive. http://www.minoltausa.com/eprise/main/MinoltaUSA/MUSAContent/CPG/CPGProducts?cname=exp&fname=exp_exp&Mname=Color_Meter_IIIf
Jeff
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