I also agree, but then when he puts his HPS in a 3x3, without spending a reasonable amount of money on extraction (which he doesn't want to do.) then his plants will die from heat stress. hes mentioned he can only afford enough for a 900w vS light, which is around £200, i'd rather spend that on a HLG LED then a HPS knowing he doesn't have extra money to cool or extract the amount of heat a hps puts off compared to having bought a LED knowing i can control colder temps better. Also hes growing in a closet, not to mention its coming up to summer soon, there a lot of factors involved, where he puts his closet, the climate he lives in, what are his methods of extraction, etc etc, but when it comes down to what hes asking, i'd rather have a quality LED in a cooler grow space then a HPS in a hotter one, especially knowing the quality LED will last 10 times longer then the HPS and giving me more funds in the future to play with extraction.
also when i say LED i don't mean a crappy mars hydro or viparspectra i mean, a good one.