Wish to replace older, white flood bulb with white/soft white; or light blue LED (not color changing), but am unsure what to ask as well as what to consider to be certain I will make an informed decision. Can yo help? Thanks very much. The back of the lighting fixure reads: Ameican 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.