Christmas Lights. Just because the Virgin Mary in the Nativity Scene is lit up with these lights, doesn't mean you can grow a Virgin Mary with them.
I have seen pics somewhere of people sacrificing a giant Rubbermaid lid drilled full of 1/8" holes, and poking Red & Blue Christmas LED 's through. Kinda, sorta, maybe I suppose could possibly work. Just because they are red & blue & LED dont mean they are rocking the correct light spectrums, or rocking much at all.
Presumably, you saw these pics too and wondered if maybe you should try.
IF you serious about a DIY LED project.... here is the same supply place that serious LED grow light manufacturers {probably} get LED's at.
>>>> http://www.kingbrightusa.com/newscatalog2010.asp <<<< Soldering and figuring out a power supply required.