I think after seeing a bunch of LED grows here it is definitely worth it to get multiple lower wattage LEDs, especially if you're intent on needing a full 900W. One of the biggest problems I face with only one LED is that when I have a plant at like 8 weeks and one at 2 our 3 weeks is that I am playing a constant game of stacking the plants and making sure both are the correct distance from the light, with multiple LEDs this isn't an issue as you can just raise and lower the lights.
I don't think you could wrong with any one of these combos:
- 2x GN MS0004 - if cost is the biggest driver
-2x GN MS0006 - if results is the biggest driver
-1x GN MS0004, 1x GN MS0006 - hybrid, almost like one veg one flower LED (though both are full spectrum)
-2x BS240 - if cost is the main driver and you prefer blackstar.
If you wanna see what these GN LEDs can do I'd go over to that forum and check it out. I may be biased though since I just got mine and have been lovin the results haha.
Best of luck!