How long do you intend to leave them on? Something LED would be the least draw, and least heat. Armoires usually are all wood, so having an incandescent light in there would not be a good idea, since the use is usually for clothes storage. It would be a fire hazard, to use an incandescent bulb and to forget to turn it off, and then shut the doors. I think battery-powered pucks w/LED elements would be a good choice.