Pond Lighting

Do you plumb a UV light for a Koi pond for the pond water to flow through it after the water has passed through the bubble bead filter?
photo credit: zappowbang

I am looking for a light fixture to replace an existing typical 110V “decorative” light fixture that is hanging (pendant type) over my outdoor koi pond. I want to replace it with a fixture and bulb that will act as a grow light so that my water lilies have a chance to bloom. [...]