Here are a few of my friends Aquarium (& Pond) keeping Resource websites:
This website from a friend contains a very popular articles with 100s of hits per day (a lot for the narrow spectrum of high end aquatic lighting):
This includes this resource: Unique Aquarium Information Articles where this friend also links to many of my articles
This is the most accurate guide anywhere on the internet for finding the correct top notch replacement for UV-C Bulb to fit your UV Device
Thanks for share info 😉