Light Outputs (At 240V Supply)
For lighting in areas where high vibration is imminent, single coil filament lamps are preferred, as they are more robust than the double wound type. (Refer Figure 22.1) The luminous efficiency of 100W single - coil and coiled-coil lamps are as follows: 11.6 lumens per watt and 12.6 lumens per watt respectively; and Efficiency = O ut put (lumens) Input (watts) An increasingly popular variation of the incandescent lamp is the Tungsten-Halogen type. This construction has a gas-filled quartz tube or bulb, which also includes a halogen vapour such as iodine or bromine. When the filament is heated, evaporated tungsten particles combine with the halogen vapour to form a tungsten-halide.
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