"Don't confuse the noobs" with your pseudo botany thermal dynamics. You're assuming full spectrum sunlight (good for half the loss), a for horticulture inefficient and too high blue spectrum (lol... good for at least 10-20% of the loss) and some average crop with inefficient structure, which cannabis is not. Respiration also takes place during the dark period...
Strawman
He was obviously talking about the effect on the plants and not the cooling requirements. It's your neverending ignorance about light is heat and biased interpretation of photosynthetic efficiency that is misleading.
One obviously won't need the same amount of watts with led to get the same amount of light as hps... thought you would have figured that out by now, yet you're still blindly comparing watts to watts to insist on not being so awfully wrong. Try comparing led to hps btu/umol instead of pretending led and hps are both synonymous with watts.