LeastExpectedGrower
Well-Known Member
Is there a reason you're quoting me then saying exactly what I said?"There is a prevailing consensus that 75 °F is the ideal ambient temperature to grow Cannabis under HPS lighting without CO2 supplementation. This experimental result indicates that an 84 °F ambient air temperature is required to achieve the same optimal leaf surface temperatures when using plant-optimized LED lighting-- and that a 75 °F ambient air temperature with LED lighting would not achieve optimal leaf surface temperatures, slowing metabolic rates and leaf and flower production."
If you want more articles you could find them yourself hps and leds are a whole different style of growing every factor humidity or temps air flow and the ways even wind hits the plants might affect (leaf surface temps) that's why I say using your IR gun measuring at the canopy is more true than ambient temps.... many people run into issues they never would think of as not over watering but plants exhibit sign of over watering like wilting could be lack of oxygen to the roots because not enough perlite and takes too long between watering which could also deplete nutrients in soil or not enough Transpire through stomata due to low surface temps and poor exchange of c02& oxygen
