The Lektron Retrofit Post Top LED Fixture Lektron Retrofit LED Post Top Fixtures are lighting retrofit modules that rduce maintenance costs and time and provide savings over ten years versus traditional options. These high efficiency units contain no gas, no glass, no mercury, no starters and no flicker. This LED retrofit module system replaces the conventional bulb, socket and ballast assembly in the Dynamic Lighting Solutions DC210 Post-Top Luminaire. It uses the existing diffuser and housing. Solid State LED lighting thrives at sub-zero temperatures, and easily withstands the high vibration of tunnel and bridge installations. It requires about half the energy of the conventional bulb, and easily provides 50,000 hours of dependable light, typically 12 years in normal 12 hour/day lighting applications.