Re: Today I have...
I had a teacher do the LED thing, doesn't work out so well... He ended using white/yellow/blue/red/uv leds, the plants grew decently, but not as great as what a plant will do in full sunlight.
The thing to remember is the plants need to be fully surrounded, if they don't get enough light, they will try to quickly get to the light source, and will be very string like.