LED stands for Light Emitting Diode. This type of lighting is basically a semi-conductor device that converts electrical energy into light. Individual LEDs are very small, usually about a quarter-inch in diameter. In a desk lamp or outdoor light, for example, they can be arranged in a circle pattern or grouped in a tight cluster that mimics the look and placement of a conventional light bulb. They are highly energy efficient, typically using 85% less than an incandescent bulb and 50% less than a CFL. LEDs make sense for anyone who wants to conserve energy and is interested in energy efficiency.