This is a replacement LED bulb for a low voltage MR16 fitting. This Lumilife LED bulb is an energy saving alternative providing 320 lumens of light while using only 4W of power. An incandescent bulb providing that amount of light would use 50W.
This a wide-angle LED array giving a beam angle of 120 degrees and a cool white light suitable for reading and intricate work.
LED bulbs are cheap to run with a much longer lifespan, and have a much reduced heat output.
The bulb can be simply inserted into a suitable MR16/GU5.3 light fitting with a 12v transformer supply. The transformer and light fitting are not supplied.