Thanks for being patient with all my questions- and here's more

I am hoping the temp will be okay since it is in the basement and I live in New England, so it stays pretty cool down there. I can leave the door open most of the time, and with the two fans you suggest, it should be okay?

I have heard that Blue Haze grows a bit more like an indica, but if not, how tall do you think the girls will get? What if I pruned them a little? The ceiling is about 8 ft.

I have to talk my husband into the purchase of the light. I think since we spent 60 euros on the seeds we should spend this much on the light, since in the long run it will pay for itself, right?

When do I need to start the HPS light- how many weeks into veg?

Thanks so much for helping me! I will share pictures once the babies grow-