Deepwell Aqua
Underwater lighting kits for still ponds, waterfalls and cascades, natural wildlife ponds, swimming ponds and pools, fountains and jets, and rills and water channels — each in 2700K warm white, 2200K amber and colour changing.
The choice of output is the real decision. Warm white for formal water and anything moving; 2200K amber for a wildlife pond, where it is markedly less disturbing to amphibians and aquatic insects; colour changing for entertaining, used sparingly.
All IP68 with the depth rating stated. Use resin-filled joints, not gel, on anything permanently submerged, and remember that the supply feeding a pond is a special location under BS 7671 — that end is a job for an electrician.