TripleOG, you've made some really insightful comments on this thread that have helped me massively. I was wondering if you wouldn't mind linking to some halogen/heat/IR bulb examples that you would recommend for a good red light setup that I want to make in my office at home. Thanks so much.The idea is to target the greatest efficiency between the 600-900 range (or more if you value those ranges). Can always filter out the shorter wavelengths if you wish. This is all going off the black body radiation curves, as seen in post #5. LEDs are great for high irradiance needs between 600-900nm. You'll need to look elsewhere if you find value in longer wavelengths, though. Personally, I find the heating wavelengths a great, even necessary, addition to red light therapy.
I'm not too familair with Xenon bulbs. They're spectral distribution didn't seem better than halogen/incandescents, with regard to >600nm.