Photobiomodulation is known to have a beneficial effect on cells, but excess infrared light can have adverse effects. This is widely known, and it‘s the reason infrared therapy devices don’t operate at 1kWh, but rather 2-4 orders of magnitude lower. Exciting electrons is enough to stimulate or stifle cytochrome-c-oxidase.. and there are other similar processes in the body that are simply not well researched. And this is no BS research but a field with 1k+ papers, many of them well cited. Infrared light is electromagnetic radiation. I don’t see how people like you can still be so sure of that „no adverse effects“ claim. If there are beneficial effects, there must also be detrimental effects at some point.

If you are interested, look at Prof Hamblin‘s work.