The W6300 series is designed to be the most reliable and easiest to implement linear submersible solution available. The W6300 is suitable for installation up to 9 feet (3m) deep in fountains and other water containing vessels not intended to accommodate the partial or complete immersion of persons.

https://hydrel.acuitybrands.com/products/detail/346436/hydrel/w6300/linear-led-fountain-fixture