Introducing the CPO-TW range of Master CosmoWhite Metal Halide light bulbs featuring a PGZ12 cap which, combined with a unique burner design and positioning makes for the very best optical efficacy. These compact lamps are 50% smaller than SON/HPL light sources, are fully dimmable and emit a highly efficient white light. As a new generation ceramic MH this range offers the best colour rendering, lumen maintenance and lamp life (32,000 hours) in our range.