Weezy90answered grow question 6y ago Hi!
I think this is a good choice for an HPS lamp. 400 watts will definitely be sufficient, as it can get quite warm. The other options of 600 watts and 1000 watts are too heavy for the size of your tent. With an LED, I would comfortably say to go a bit higher, but with HPS it's too risky for burning. Also, make sure to have enough ventilation and fresh air intake.
Good luck with growing! 😉 🌱