No they aren't.He can grow under a 400w in his room. Reflective walls are over rated. It's so important that he finds a pheno that puts on rock hard nugs. I have one plant that's a freak.. the nugs are just crazy hard. You can grow that thing under a 60w light bulb and I'll bet you get nugs.
With tall sativa plants, it won't do well under the 400.. the buds will be airy.
I also agree with the guy that said to use the bulb down the middle. That's what I would do in his situation. If he has the right plants, he'll do real well.
Why do you keep giving people incorrect information? Are you doing it on purpose, or are you just too stubborn to admit that you're wrong?