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Incandescent Filament Lamps (GLS and Reflector)

Answer

GLS (General Lamp Source) Filament lamps are used mainly for domestic and decorative/display lighting. They come in a variety of finishes determined by their use – clear, diffuse/pearl or coloured.

Reflector lamps usually bell shaped with an outer envelope with a reflective coating.

Advantages:
- low initial cost,
- simple operation (no control gear required)
- good colour rendering.

Disadvantages:
- low electrical efficiency,
- relatively short life,
- light output is particularly sensitive to voltage variations causing short lamp life.


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