I think it's great that they have made them smaller, not only does it work better but it means you don't have to fork out a thousand quid if you only want to do a small grow. Look at budmaster, their smallest light using the new Osram diodes costs over 800! I know it might cost a lot to cover a larger area but it will be worth it, if not this generation then at some point. We should think ourselves lucky that we have people willing to test them out and show us the results on this forum so we who are less experienced don't make blunderous purchases time after time.
150w is actually a massive amount of power in reality, 150w of 100% PAR would obliterate a 1000w HID light theoretically, The amount of power wasted in heat let alone spectrum is massive. Diode technology has had some major breakthroughs fairly recently, I've been reading that some new diodes achieve a little greater than 100% efficiency for the electrical energy input! This sounds like its breaking the laws of physics... It's not! These special LEDs source heat from their surroundings and output it as light. I have no idea whether this is used in the LEDs in these grow lights, but you can see how you could get close to 100% efficiency of 100% PAR with the right spectrum, or even slightly greater in hot climates!