'Three or four 250-watt, red infrared heat bulbs. These are sold at many hardware stores.
Do not use clear heat lamps as their spectrum is not correct. My preferences are Philips, General Electric or Sli lamps. Sylvania and Feit now have short, straight, tightly coiled filaments that focus the heat too much. The effect is more like a spotlight than a floodlight.'
Mine works really well. Think I'll stick with it. But thanks for the info!