i kinda posted something like this before but i was still wondering. i was gonna go SCROG and was wondering if these would help at all. Maybe the could be a supplementary light. u could get a mother board full of these and use them if they worked and u could get them really close to ur plants. they dont take much electricity, at least i dont think so. this is a site http://www.ledsupply.com/l3-0-u5th15-1.html
its a neat idea. certainly worth looking into it. but alas im a botanist and not an electrical eng. i hear they are very efficent. and seems u can direct them with alot of accuracy.
i think that in order to flower a plant with LEDs it would require too many t be cost effective... a few thousand LEDs is gonna cost a few hundered bucks, and cover the same area as some CFLS or a small HPS security light....