Arrangement for illuminating water column, has glass tube closed at top protruding above water level in water-filled container, horizontal opening in lower region, and illumination device in upper region

摘要

The illumination arrangement has a glass tube (2) closed at the top arranged in a water-filled container (1) so as to protrude above the water level and with horizontal opening (3) in its lower region, which is completely under water and an illumination device (5) in its upper region. The water-filled container can be an external pond or an aquarium.