You kidding?
Yield, HPS.
I think you need to do more research in the next 1-2 days instead of buying a lighting system you dont know enough about.
Serach. theres enough info on this site for you to be able to make a informed desicion.
Sounds like your an asshole.
If he payed for it then its his.
If he wants to mouth it, let him mouth it.
Yes you should feel bad.
Go give him back his weed.