Well thank you for actually making a decent argument!
Now, if you could avoid being such a condescending egotistical prick, these discussions might be more productive and less troll-ish.
Tell me though, why does it makes a difference between blurple and white if it's all light=heat anyway...
White Cobs, specifically 3K-4K Temp, are delivering more
radiant energy per watt in the visible spectrum than any other light source you mentioned or cited, with a
broader spectrum.
Note: The white light (brand? Model?) raises the leaf temp more than the Black Dog, but uses the same wattage. I wonder what PAR/ LUX readings were? Also, what were the specs on that COB grow FLIR pic?
You keep referring to wattage, which is relative to the (yes, I'm gonna say it) efficiency of the light source. Higher efficiency = More light regardless of wattage.
But what kind of light? Visible Light.
What stimulates photosynthesis? Visible light.
What visible wavelengths raise leaf temps?
ALL visible wavelengths. Not Just IR.
"Additionally, much of the visible light HPS bulbs produce is yellow and not highly-utilized by plants. This radiation not used for photosynthesis or other chemical reactions only serves to heat up the leaves"
In fact, CLEARLY leaf temperatures will raise even with the absence of IR.
As the FLIR pics you posted show, Leaf temp is easily manipulated with adjustments in ambient temp, regardless of the light source.
If Leaf temps are equal, the light emitting more photons in the photosynthetically active range gets my vote.
Please let me know where I have lied, made shit up, or insinuated a scenario involving a light in a vacuum chamber.
Why don't you pull your head out of your ass, and
attempt some critical thinking before trying to "straw man" everybody?