Post your latitude (N°/S°) and type of grow light you use

I'm at 43.5°N Ontario and using hid (hps for now)

56 ish and of course hps if you use leds you gonna have to supplement heat in lights off i think you will find is the general consensus plus led growers are better off running at a slightly higher leaf temp vs hps growers anyway as well so i think if your far north except in warm summers hps or a combo with leds wins in that respect ime

Not sure what latitude has to do with what lights you use but I've used HIDs since 1982 to good effect.

To old to change now at 69 today!

My favourite number too.

I'm around the 56th myself up here in Northern Bumf**k, Alberta.

36. LED