I only counted five lamps. There must be one below the bottom of the pic.

How did that grow turn out for you?
Do the sides of the can get warm? Is it a metal or plastic can? The reason I ask is that I'd be a bit concerned about heating up plastic as it can out-gas some unpleasant chems, even under low heat like the T5 produces. The plastic doesn't have to burn to out-gas.
I used 324 watts my first grow a few years back. Got over 6 zips of mid grade bagseed bud. I haven't bought bud since.

(praise the bud gods!) That's why I figure it's a bit much for a mother plant.
I thought about doing a tin garbage can grow way back, but instead I built up a small storage cab. It was a successful grow, but only netted me about a half zip... Oh well, live and learn...that was an early experiment over a decade ago. I use the cab for seedlings and cuttings now.
I was going to keep nice Purple Dream mother plant in the cab, but I wanted to shut down production over the summer months so I could go on vacation without concerns.