They actually take human generated body heat in special clothing and convert it to infrared and send it back to you. The wavelengths count. For what they're trying to do they use ones that generate very little heat, at least that's what they're trying to do, but hit these particular wavelengths that have biological stimulating effects.

On the larger scale they have those magic wands or full body machines. On the surgical scale they try to stick fiber optics at specific locations for the light stimulation.

Either way my use of a heat lamp would pick up a slight amount of the biologically active wavelengths (If it is producing any, not even sure it produces anything within the correct range) as well as cooking me.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5505738/