DIY underwater lights

Question:
Have you ever made underwater fish pond lights yourself, HOW ?
I refuse to spend 80 dollars or more on little 12 volt LED lamps or other types. What about LED lamps in water-tight containers, SELF made? Has anyone here done it, and what problems did you encounter? The solutions?
Thanks. My goldfish pond is 3 feet deep in the middle, and maybe 6' x 8' rectangle. 33 fish. Some babies every spring.


Answer:
I would not try to make underwater lights myself. Electricity and water together can be deadly. Sealing the lights safely will be impossible. Don't try it.