LED recessed lights, also known as "LED can lights" or "LED downlighters" can be used for a wide range of residential, retail and commercial applications. "LED" stands for "Light Emitting Diode", which is another way of saying that it's a computer chip, semiconductor diode that emits light. LEDs are available for recessed lighting as either replacement bulbs, dedicated housings, or as LED retrofit modules. The modules can easily be installed in virtually all recessed housings with a screw-in, Edison base socket, without the need for rewiring. So, why use LED recessed lighting? Energy Savings, Less - heat Better color, Longer lasting, Get dim.