430-439 mm Long Metal Halide Light Bulbs
Metal Halide bulbs are a hybrid of Mercury and Sodium light bulbs. These light bulbs may also contain halides of metals including scandium, indium and dysprosium.
Operating Position/Burn Position
Some lamps are position orientated and have been designed to operate at a certain position. As a result their ratings for these types of lamps have been based on operation in this position.
Burning position orientated lamps in a position different than intended can seriously hamper lamp life, lumen output and colour.