Edison must have not heard about that particle depletion. The last time I looked....many years ago........his bulbs were still burning brightly.

 

Way back when I used an IR water-cooled lamp fro, I thought Reseach Inc, The water cooled the reflector. Could easily get to something between two pieces of graphite to 1000 C. See: http://www.pcscontrols.com/products/lampir-quartz

 

thanks KISS, that's a helpful link!

 

5. Are all halogen lamps dimmable?
Halogen lamps are designed to operate at very high temperatures to ensure optimal performance. Dimming at above 60% of the rated volts can be done. Dimming below 60% of the rated volts can cause blackening and alter the tungsten halogen regenerative cycle process thus reducing brightness and lamp life. It is recommended to revert to full brightness for 1 minute prior to switching the lamps off.