Freshwater aquarium lighting is commonly provided by screw-in incandescent bulbs, fluorescent tubes and LED lamps. Incandescent lighting is becoming less popular because it uses much more energy and produces more heat than the other lighting types. Compact fluorescent lighting with a compatible screw-in base is frequently used as a direct replacement for incandescent bulbs. Other newer sources for planted aquariums that use less electricity and produce less heat include the T2, T5, SHO, and LED. The LED aquarium light fixtures generally are the most efficient, although the T2, T5, and in particular the SHO, have their positive planted aquarium applications as well.