Lighting continues to evolve. From the introduction of the incandescent lamp over 100 years ago to metal halide technology, the user is faced with an ever increasing number of choices. Each technology has its own set of advantages and limitations. Metal halide with its high efficacy, white light, long life and compact size is finding its way into many lighting applications; replacing the more mature technologies. Developments in metal halide products over the past five years have expanded the available choices. Many new product families have been added which provide the user with unique benefits which overcome some of the limitations found in the standard products.