The P28S is a single-contact medium ‘prefocus’ cap, which aims to precisely position a lamp’s filament in relation to the optical system of the luminaire. It does this by the use of two winged side flanges, which ensure the vertical alignment, lateral alignment, and rotational alignment of the filament. The specialist bulbs that use this cap are used in TV, film, and stage light fittings.

Alternative names:

Medium Prefocus.

Bulb types:

T28 (LIF code) Theatre Lamp.

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