It gets hot in there with that many bulbs, need good exhaust flow. I would put the 6500K next to the exhaust, not on the other side so that the heat can be directly pulled out. And if you can get a top exhaust then that is even better. I did a pc grow and with 4 23 watt cfls it would reach...
Those buckets are $50 each, 15 would be very pricey.
All you need is a 5 gallon bucket, some tubing, and an air pump.
That would be way less $ to just do it yourself.
And the other item is $200
You could make that for $20.
Just go to a local hardware store to get what you need.
You can look...