Difference Between Halogen and Tungsten Filament Bulbs in Saving Electrical Consumption

There are several types of light that could be referred to as 'halogen', most commonly are tungsten halogen which are very similar to normal lights and metal halide which are discharge lamps.

Tungsten halogen bulbs are able to run hotter and therefore brighter than 'plain' tungsten bulbs so for a given amount of light the T/H bulb can use a bit less power. T/H tend to be used where the colour temperature (whiteness as opposed to yellowness) is important for good colour display.

Metal halide lamps are often used in shops giving a very efficient but slightly purple tinged colour, the require completely new (and quite expensive luminaires)

Low voltage lamps tend to be more efficient than mains as the filament is shorter and more compact but there is additional cost in the transformer/power supply required.
The most efficient lights are LED 'bulbs' but again they require a dedicated type of power supply or more expensive versions of the bulb.

LEDs have the advantage of a very long lifetime, so reducing maintenance costs.

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