It's hard to argue against having energy-efficient lighting installed in a parking garage. Even garages that were built recently with traditional metal halide or high-pressure sodium fixtures should be considering a retrofit.
LED Retrofit Downlight Series by LumenOptix™. Converts any make or model of existing architectural downlight to LED. Available in 6",8" and 10" configs with various lumen packages and options. Specification grade construction featuring tool-less installation in minutes from below the ceiling!