Hey ksj, I was looking at the latest rebel LEDs. They really do look fantastic, philips recommend running the LEDs lower than rated, improves the reliability while only slitly reducing output but giving much better engergy in to light out efficiency. They produce twice as much light as standard LED.
I checked it out becouse I thought the rumours about the new GrowNothern panals where unrealistic. But if ya do a search you can find 'Engery Saving Trust' measuements on the bulbs. There so good 'EST' are going to have to update their formula 'cos if come up with an efficiency rating of 130% (which is impossible).