LED HID retrofit lamps are designed to replace inefficient or burnt-out HID lamps. HID retrofit lamps provide the easiest and most cost effective incorporation of LED technology that you can install in existing fixtures. They are constructed with hundreds of stand-alone light emitting diodes (commonly referred to as LEDs) that are evenly spaced around the entire shape of the lamp. LED HID retrofit lamps are up-to 80% more efficient than traditional metal halide, high pressure sodium and incandescent lamps. Due to their low up-front costs, they are more and more popular for customers looking to install LED technology, rather than replacing the entire light fixture.