Its a 240 from the wall thats the wattage for a 2x4 tentI've been involved in many of those discussions. They are all over this board. lol. Do a search ... you will find them. If money isn't the issue, purchase something you will be happy with. I think the Amazon light you are interested in would end up being a disappointment to you.
Personally, I would go with 320watts of light from the wall in a 2 x 4. It's a bit over-kill so be sure to get a light that has a dimmer.