SMALL-SIZE SUBMERSIBLE LUMINAIRE Russian patent published in 1998 - IPC

FIELD: lighting engineering. SUBSTANCE: luminaire has water-tight casing accommodating reflector whose concave reflecting surface is formed by body of revolution in the form of truncated spheroid, halide lamp mounted so that its longitudinal axis is positioned along main optical axis of spheroid and its filament center is in first focus of the latter; it also has heat-resistant window made of white sapphire plate whose axis is perpendicular to main optical axis of reflector. Heat- resistant window covers face side of casing and is attached to it through water-tight joint; it is spaced from first focus of spheroid at distance of one third and half that between spheroid focuses. EFFECT: improved design. 1 dwg