Strain for cold weather?

Okay so if I was you. A bigger light will produce more heat. You can do DWC. Autoflowers like it a little cooler. You might need to add a small heater with a thermostat for colder parts of the year. Then research for strains that basically evolved in cooler temps. Strains that like colder is white widow, northern lights, blue dream, Durban poison, super skunk, green crack, harlequin are some.

I mean if 16 is the lowest it’s ever gonna get at night- it’ll be okay but far from optimal. If you’re anticipating those night temps to go down as things get colder, that’s an issue. If it’s your only option - it will grow in these conditions but other issues are usually exacerbated with suboptimal environmentals. I don’t like to recommend autos but their ancestors were found in Siberia I believe.. or just go for a heavy indica photo

ich baue im Schlafzimmer an Schlafzimmer ist nicht geheizt es hat 21 Grad im Schlafzimmer under der Pflanze geht es Gut. Kalte Jahreszeit würde purpel anbauen die sind das gewohnt

You're going to have to get a heater in there. 16c is pretty low. It won't kill your plant by any means, but that low is not optimal. Consistent temps in the mid 20's is ideal. a 60% humidity is ideal for veg maybe 65% Consistency is what weed likes best. Consistent temps and consistent humidity. If your plants are on concrete floor then you'll wanna get them off the floor and onto something just to get them off the cold floor. 22.9c and 46% humidity will work however.

Your temps should be fine. I wouldn't worry much unless they start to dip under 10 degrees at night. Your indica strains should weather those kind of temps better. Your "purple" strains tend to express their colors more in colder temps.