You don't need to spend a fortune on a UFO type light, if you know a little bit about electronics you can make your own CREE XLAMP blue, red and higher lumen P4 Q emitter 6500k emiters for your panel or fixture. I've made two so far, one red panel, one blue panel and now making a red/blue and 6500k hybrid. Reason I made them separate was I was lazy as the blue and red are different voltage, as I wanted parallel simplicity when I started soldering and wiring, but I should have taken the time to do it properly the 1st time.
I'll be phasing out my MH and HPS in the near future. The CREE XLAMP emitters are about $5 each. I totally agree about your timeframe of 2-3 years, last year the intensity of some XLAMPS went up roughly 70%, not quite Moore's law, but close. The future will be high intensity LED emitter fixtures, not those silly 15 watt LED panels sold on Ebay, which are about next to useless compared to XLAMP and other LED emitter types. Gotta love technology and these LED emitters, they are they future no doubt.