This is a really interesting article, Andy. Thank you for sharing!
My takeaway from this article is that LED's naturally produce blue light regardless of their advertised color temperature, and they produce far less heat (mid and far-infrared waves). There is also much less near-infrared radiation emitted by LED's, which is present in incandescent lighting.
This makes sense, because I find myself having tired eyes when under the light of LED bulbs, due to the lack of infrared radiation, as the article mentions. It's really fascinating how the lack of infrared radiation presumably makes the human body function and produce energy less efficiently (leading to fatigue and headaches). I would like to see more research and objective experimentation done on the comparison between LED and incandescent in relation to metabolism and overall health. It makes me wonder if there is a way to eliminate all blue wavelengths of light from LED lamps. Perhaps a more advanced fluorescent layer on newer bulbs will more effectively filter out the blue. What about red LED "party bulbs" or red LED's on Christmas tree lights? Do they emit any blue radiation? I do recall on a strand of colored Christmas tree lights last year how much disproportionately brighter the blue LED bulbs appeared than the other colors. I could tell by that how intense and harmful blue LED light can be.
I am about 90% incandescent and halogen in my house. This article has made more skeptical of LED lighting, and I will especially keep it out of my bedroom. I am partial to the beautiful 100 CRI light from halogen lamps and the warm, infrared emitting glow of incandescents
