Here are 5 JBxSWTBLU ladies in a tent under 1 - 400w 4k CMH and 1 - 150w 3k CMH (metrolight eballast). They are in 2g smart parts in coco dtw. crappy phone pics. 21-25days 12/12 or so. Not my tent. Just watching it for a day or two. I germinated and vegged these for the first two weeks.
JW - Heat is less than a comparable HPS, but it is still an HID. Now, I am using a modified freezer that is 27"x24". So as it falls within an area of expertise for me, I was able to accomidate this bulb without any worry of heat troubles. If I put in a little more effort, I could probably manage the heat from 2 x 315w.
Finding a fixture to just pull out of a box and run is difficult at the moment. It is best to do what rives and I have done...... Buy the ballast, buy the socket and then the bulb. Retrofit an existing reflector or hood by replacing the mogul socket with the PGZ18 required for this bulb. Then to find a home or proper enclosure for the 240v ballast....... I have plenty of NEMA3 enclosures laying around and industrial time clocks, so I just ran a circuit from the breaker panel, added a 20A twist lock outlet and went from there.
You can buy fixtures using this bulb and ballast that I think would be an easy mod though. Try
http://www.bestlights.com/products/
Better than other lighting that you've tried???