Might beat it on PAR but won't match coverage.
http://timbergrowlights.com/900-watt-cree-cxb3590-5x5-framework/ 900w COB fixture, it's advised to be hung 12-18 inches, no 1000w hps should EVER be hung that close to plants.
Vented, yes, I did it all the time.
I have no idea where plant reflectivity comes into this conversation. My only point about the sphere/datasheets/PPF output, is that it's common ground. It's the information that every manufacturer should be supplying because it's non-biased.
Not directed at you, but when someone promotes a lamp who's website offers no technical data and then suggests that I'm taking advantage of newbs... by offering all the technical data I can, it erks me a little bit.
You're misunderstanding me. You should supply both real data @ mathematical if you want to cover all your bases. But never mathematical over real. That's absurd behavior & borderline false info.
You know I'm right. Also, Amare has provided every single customer w/ the answer to any & all questions. Not every website is designed to confuse poeple that focus on growing only & haven't a clue what it is we speak about in this light lingo.
My big big grower friends heads spin when I talk about my LEDs.
But that doesn't stop them from harvesting 20#'s at a time in multiple rooms/opps.
They just count on me to learn it all & tell them what to buy. That's why the Big-Dawgs I know in my state are now switching to my recommendations in led.
Not lil Tastys made only for tenters.
Damn, I've been building my never ending room n come back to all kinds of falsities going around.
Be careful what you believe guys. Could cost you thousands in lost yields.