Dude, flower with the blackstar, I think you will be pleasantly surprised as I was. They are kinda ho hum for veg, in flower, you really start to see their effectiveness, especially later on, since that is what their entire spectrum for that model is geared towards.
I would just to with a 500W blackstar. Why settle for 180W for $549? Cree is just a name brand, so is bridgelux. From what I gather from Gotham, they use both of those brands, along with a few korean manufacturers. You'll be pulling 285 watts or something like that from the Blackstar, and for the same amount of money. So consider carefully. Honestly I wasn't blown away by blackstar until late flower, and them boom, never ending flower. Constant bud growth. Week 7 and the plants start to go nuts instead of shutting down. New leaf growth, the whole 9, just some cool stuff.
I havent seen a single difference between anyones LED grows honestly (short of two professionals will setups that make HID users blush with movers, CO2, nute monitors, just nuts stuff that most growers don't have the commitment or money for). Outside of that, I haven't seen a single 1000 dollar panel blow away a $300 panel of equal draw and spectrum offering. I think that people just want to spend money on something to get the piece of mind that expensive things work better. I find that logic to be generally false in almost all applications, especially one with as many outside variables as growing.
So thats my 2. Isis makes great panels, so does grow panel, so does Blackstar. The big difference is the money, not the attributes or diodes b/t the three.