Can you hang an outdoor light fixture inside?

I would like to know if an outdoor hanging lantern fixture ( not a candle but one you would hard wire) can be installed inside. I would like to hang a hanging lantern in my sons room for his main light fixture but don't want to pay the indoor prices for a lantern pendant or chandelier when I can get creative and buy one for under $50 bucks that is made for outdoor use. HOWEVER, I want it to be safe, so I was wondering if anyone knows he difference between the electrical of outdoor and indoor lighting? Is there a difference? Is the wiring different. Most look to be the same to me, and use the same watt bulbs and by using it inside it isn't going to get wet or be in hot weather so I was thinking it would probably be safe, unless there is something I don't know since I'm not an electrician. Has anyone else ever done this before? Thanks for your feedback!