My son is now the proud user of a loft bed with his desk under the bed. It is perfect for his needs, but the area requires better lighting than just a desk lamp. Looking at under counter lights and like the halogen option, but am concerned about the heat. Any suggestions on what bulb type and perhaps a fixture?? T5 fluorescent? LED? Halogen?? This is for lighting a desk under a loft bed so needs to be shallow surface mount, span about 6 feet and generate only modest heat.