Ignore him, don't change it to 12/12, its too small.

I see you're using a regular (incandescant) lightbulb, that is no use whatsoever for growing, thats why your plant is skinny and kinda pathetic, it may suffice at the moment but not only is it being EXTREMELY wastefull of your electricity your plant isn't going to get much better than that.

Simply changing that bulb to a compact fluorescant (energy saving bulb as we call them in the UK) and lowering it will increase your chances of success.

Good luck,
Jonny