I think 6 is too many plants for a 4x4, you may have some crowding issues. But two HLG 100s would probably do well in there. I did a single Hindu Kush Auto with my hlg 65 and it was some of the best dense earthy bud I've ever grown. It was just a test of that one single light, I wanted to see what it could do. I was impressed.
I say get those two hlg 100 and then throw the blurple you have in there with em, It's not going to hurt. But like i said, 6 in a 4x4 seems tight to me, but ive seen guys do it
I have 4 HLG 304s in my flower room and ive considered just getting 4 HLG 100s instead.
Right now i have the HLG 65 next to my first LED, also a shitty blurple lol. Im just vegging these plants until its warm enough for them to go outside.
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