Over the shower is "wet", because it may get splashed with water. "Damp" means moist or high humidity, as in a general lighting in a bathroom with a shower/tub but not directly over either, or outdoors but under an overhang protected from rain.

I think if you mean putting an LED light bulb in a recessed "shower light" with a sealed lens, as long as the bulb can be used in a fully enclosed fixture, you're ok. If you're talking LED modules with built-in trim, you'll need one approved for wet locations. The Commercial Electric that HD sells for 4" or 5"/6" cans (made by Halo i think) will work; the Cree 4" and 6" modules (sold as "Ecosmart" at HD) won't since they're damp only, which is too bad since they give off better quality light.

Thank you for your help. HD does have a 5" led for wet locations. unfortunately, the clearance in my attic is so close I dont want to risk trying this size.
Tim