I use 42w=150w's and I start with 1 and work my way up once it grows. At the size you're currently at you can just keep 1 on it, then as you need more coverage increase the amount of bulbs. I don't even get to all 4 bulbs until I start flowering after 1 month(i grow DWC so my timeline is a little faster than yours in soil though).
That will help with your current heat issue, of course you eventually have to get up to the 4 bulbs and will have the issue then but worth something I suppose. As for heat, I grew in mid to high 80's with no issues at all(again hydro not soil, idk if that makes a difference), I asked my hydro store guy about heat and he said no worries at all, keep in mind that pot grows in 90-100+ degree weather outdoors. But it sounds like HookahsGarden has seen issues from heat in their experience so I'm not discrediting what they're saying, sounds like this being your first time it could just add another variable to deal with.