Punctual filament lamps are lamps whose main features are to be found in the position and the shape of the filament.
The aim of these lamps is to achieve high-levels of light beam precision.
With these types of lamps the manufacturer gives the L.C.L. (Light Centre Length) which corresponds to the distance between the centre of the filament and the contact or the bayonet fitting depending on the type of lamp.
Due to the precision required to make such lamps, they cost more than ordinary ones. Floodlighting equipment is often fitted with point sour-ce filament lamps.
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