The Variations of Metal Halide Lamp

The first MH lamps had a large outer envelope. In the last 20 years engineers have been able to make a smaller MH lamp at higher pressures. The higher pressure means a higher efficiency as well.Smaller sized bulbs with lower wattages have allowed for wider application of uses. The smaller bulbs are used in hand held flash lights (they are not very popular since they require a large battery (1+ kilo), but they do make the most powerful hand held light available). Smaller MH bulbs have an extremely high pressure up to 700 PSI (4,826,325 Pascal).