I found the following explanations on khphto's ebay store.
"250W/24V Quartz-Halogen replacement lamp for LPL model 7452 and 7452L 4x5 Dichroic Colour, VCCE Variable Contrast, and B&W Diffusion enlargers with 24V power supplies. The 24V power supplies are typically supplied with these enlargers in areas with 220V or 240V electrical service. "
Does it mean I can switch the 82v lamp and 110v power unit into a 24v lamp and 220v power unit combo, without modifying anything?? What about the fan? The fan won't burn when the mains power jumped from 110v to 220v??