Seeds want darkness, warmth, and wet.
Leaves want light of a certain spectrum, not incandescents. At the least, FLC's. A couple of hundred of actual watts (not "its just like a normal 100w bulb") watts.
You mentioned nothing about ventilation. All lights give out more warmth than the plants like. HPS lighting demands a hundred or so bucks in vent and drilling two holes in your cabinet.

Whether what youre doing is right or wrong morally, I dont know. In my Scando country, I seriously doubt the parents would get into trouble.