I've been growing with 2x 150w Welthink Wex-C150 bars for both veg and flower - 1 in veg and I add the 2nd for flower. As a veg light it's great. I couldn't be happier. As a flower light the results have been mixed. It definitely flowers my ladies with decent results but I don't get the density that I see others achieving with HPS/MH lights, and they take 1 - 2 weeks longer to finish. That said, strain and growing skill are factors to be considered. I'm still learning to be sure. What I will say is that Welthink stands behind their product. I had an issue with poor workmanship in one of the lights and they moved very quickly to deal with it.

If you are going to grow LED and invest that kind of $$ do your homework and buy from a reputable company. 3w diodes minimum and be sure it is true 3w and not some fraction of 3w... The biggest benefits I see are lower electrical draw, cooler temps, and longevity. Although note that while the diodes my be rated for 20,000 hours, the components that drive them will most likely die well before the diodes so the longevity argument has some holes in it to be sure.