I'm going to switch from my 630 DE CMH to a DE HPS when I flip. Going to run it @750W to see what happens. I've never run it before so I think I'll start up high to make sure I don't fry them.
That's what I need for next winter. My basement is drafty in these polar vortexes, LEDs just don't throw enough heat, month after month.
I reconfigure duct intakes to>furnace room(add humidity)>flower>veg>lung rm. That usually keeps the ambient canopy humidity and temps ok, but the roots still get chilly when -10f hangs around for weeks.
I'd rather just switch lights and turn on the humidifier for the lung room, than re hang all the ductwork twice a year.
The lights out humidity spike from the flower tent, vents into the veg tent is a bad idea overall. It's just gambling for PM when ambient humidity goes up.