Small, focused grow lights

Hi, need some advice. I have a paludarium with some good long grow lights on top, but in the water feature there is a cave system and rocky overhangs that preclude a lot of the light. The top half grows ferns, pothos, etc., really well, and some of the water plants get some light -- but not enough.

I would like to provide more focused spotlights down into the water. Ones that allow for more lush growth, not just seeing the fish. Preferably something on a flexible tubing that can be pointed and directed. If possible, I'd also like to use LEDs or something small that can stick on the underside of the overhanging rocks and shine down.

Specifically, I'd like lights I can put *inside* the paludarium and get good angles on the water.

Any good products for this?​ Thanks for the advice!