I've been looking about at these two - you just have to watch the comparison vids about on youtube etc to see they are no competition to CFL's or HPS and MH. What I was wondering is are they worth using in conjunction with the above. You can buy one set up of about 1000 leds that are suspended in like a random net. ie if you stretched it across the room it would dangle lots of LED's throughout your plants. You couldn't even get CFL's anything like as close as these LEDS and with them being so small you they get into awkward positions. It would be good to see a comparison between two identical set ups but one having the "extra advantage" of one of these LED set ups with it.
Have a look at the pic - this is from s seller on flee bay.