Tubular - White-Lux Plus® for SON/HPS Ballasts White-Lux Plus® metal halide lamps can be used to convert the yellow light of sodium lamps in existing SON ballasted installations to clean white metal halide light. Operate on standard HPS ballasts and ignitors Formed body arc tube for fast starting Open and Enclosed versions available - please see "Fitting Type" Metal Halide These lamps produce a clear white light and are suitable for display or floodlighting, where the heat output from tungsten halogen lamps would create a problem. Metal Halide Lamps have an efficiency approx. 4 times higher than halogen lamps and xenon lamps. In addition, the short-arc type is similar to a point light source, making optical design easy. As their colour temperature characteristics are similar to daylight colour, exact colours (RGB) can be reproduced. They can also be used for both high bay and low bay applications.,Compared to High Pressure Mercury lamps, Metal Halide lamps offer greater efficiencies and, compared to high pressure sodium (SON) lamps, they have similar advantages, but have different output characteristics. A disadvantage of metal halide lamps, when compared to SON lamps, is that they have a shorter service life.