Aquarium cover

Many aquarists successfully illuminate their tanks with T5 fluorescent tubes. These provide the basic spectrum.
For extraordinarily beautiful corals, more power is needed for lighting. 

Hybrid lamps that combine T5 with LEDs are suitable for this purpose. These have their price.
In order to counteract the relatively high costs, T5 tubes can be supplemented with LEDs at low cost in the individually made-to-measure cover.
 The result is wide-area illumination in a broad light spectrum.