/diy/ - Do It Yourself

I'm trying to build a cheapboard box for growing plants during winter. The problem is that i have little space, almost half of most people possibilities, so things like ventilation and light don't apply to my conditions. Unfortunately i can't figure out those things myself, i'm really bad with electronics. Size of the box is on the pic, could you guys help me pick power of leds and ventilators, or give me any tip about it? Thanks in advance and sorry for typos