Paul has told me , about 6 months ago they were still working on getting the 600's into production cuz of testing etc.
The 1000's are on the market now, as u know , of course. They are too powerful for my space, as they are more suited for hi bay installs. The 600's would be more suited for my application. Cheers bud.
Yes with a recommendation of 2-4 feet above canopy. And PPFD not changing much in between 2-4 ft range. Powerful little things they are.