Slip Uno Lampshades:  This type of lampshade is for any type of lamp that does not have a harp.  Instead of the more traditional clip style, this lampshade slips on to the lamp socket, and the light bulb screws over it to lock the shade in place.  This type of shade is great because it is more secure than a clip shade and you can use any type of light bulb, including the newer energy efficient bulbs.