I've got the 4200K. Supposed to make leafier plants though. The spectrum is a hair higher in output though, across the board. Good eye on the thermometer. I've got a remote thermo setup at light height on the wall, it's been a steady 75. Down at the pot though, 79-81. I like your idea of measuring leaf temps but next hit on the budget is the back half of the nute schedule, the Bud Factor X is a pocket cleaner. The a/c is small and not working too hard, but needed and necessary in my setup. I've got 2 burned plants to prove it (outdoor temp spike), with one of those in the trash and the other making an impressive comeback. Thanks for looking in, at this point you're leading the charge. I'll be checking for updates on your side often.
As low as 15 inches with a lot of fan in the pic.
As low as 15 inches with a lot of fan in the pic.