I've used 1w diodes, you'll see better results with 3w for sure. The post lists the lumens @ 10,880 (I know lumens aren't the end all be all of measuring grow lights, but a good indicator of intensity). The 180w chipset (3w diodes) light I'm using puts out 9800 lumens. Its more expensive to produce the higher wattage diodes but they really do make a difference. I've had 1,2, & 3w units. There is a reason I ditched my 1 & 2w units. While I have not used the light in the posting I'm very confident any 2011 model 3w unit from a any of the companies listed in this thread will put that light to shame.