LED High Bay Retrofit Lamps are designed to replace HPS, Mercury Vapour, Metal Halide or CFL lamps found in traditional high bays. They are perfectly suited to replacing E40 socket lamps. Some are designed for 105W CFL replacements, while other, brighter units are designed to replace 250W or 400W HID Lamps. Installation is very simple as the LED high bay retrofit lamps to fit into the same holder, simply requiring a bypass of the existing control gear (ballast) in the fitting to run directly off the mains AC power. This is a very attractive and cost-effective alternative to installing a complete LED High Bay Luminaire. Important to note that although LED Highbay retrofits are generally more affordable, they typically have a leaner life span and a shorter warranty.