we don't have the plan to produce SP400, the only we sell now is SP150 and SP250. A lot of tents won't work if they're longer, and our SP250 can be daisy chain three at a time, so the sp250 is suitable for customers of most sizesI was hoping Joy would offer me a new SP 400 or something to test lol!!!. I'd like to know what the studies are showing, because SPs are growing snowball size buds!!!!