I bought a house with an older inground diving pool. The light wasn't working so I pulled it out of the niche... I assume this is an old halogen bulb fixture. Since it was filled with thick tomato soup looking material, I'm guessing it needs to be replaced. I have no idea what would fit... The light housing is only about 2 3/4 inches in diameter and about 3 3/4 inches deep. 120v. What options do I have?