Need to replace bulb in unit whose information is described on attached image. If information is unclear, it reads: "American Products Co.; Model R-100BC, 12 Volt; Max Lamp Wattage-100; Type R-30. Wet Niche Type, Fresh Water Only; Use With Model CN-5 Fixture Housing." I haven't even the foggiest idea what most of that information means when it comes to choosing the correct replacement bulb. The burned-out bulb itself is LED, but has no information on it. Have no information about who installed it or when, but it's been been in there for several years. Where do I look, and what should I look for when choosing a new LED bulb?