My contribution to the September issue of ELECTRICAL CONTRACTOR covered lamp- and retrofit kit-based conversions of HID luminaires from HID to LED.

With up to 50 percent energy cost savings and potential maintenance savings, LED replacement lamps and retrofit kits offer an increasingly viable retrofit option for HID luminaires. However, products must be carefully matched to applications to ensure desired performance and lighting quality. As with any retrofit, a trial installation is often recommended prior to major commitment.

Check it out here.