Semiconductor lighting and retrofitting methods are provided herein. One method includes providing a roadway light that has a housing, the roadway light having at least a ballast, an high intensity discharge lamp, a reflector, a lens removed there from, the roadway light having a legacy bracket and a legacy mount disposed in a sidewall of the housing that remain, and coupling an assembly to the legacy bracket, the assembly including at least a plurality of light emitting diode (LED) lights mounted to the heat sink, the plurality of LED lights being disposed in a linear arrangement, and a support plate that is joined to the heat sink, the support plate having a mating bracket that couples with the legacy bracket disposed within a housing of the roadway light.