3. The RIMA lampThe Rima lamp, created by Dreipuls, uses a strip of 65 white LEDs that can be selectively turned on or off by sliding around two sets of metal rings. Apparently optical sensors are used to determine the position of the rings, and only the LEDs falling in-between them can be turned on. Not only does RIMA gives your desk a clean and modern appeal, it gives you the option of one or two light sources depending on what you're using it for.