I have been using UV lamps in my outdoor pond for over 10 years. They usually last about a year and I usually have to turn them off during the frost months or they die. I just had to change the lightbulb as I always know that if the water goes cloudy overnight the design is dead. I remembered buying the Revain bulb so I went back to check when I bought it and was amazed that this bulb actually lasted over 2 years, 2 years and a month. Needless to say, I quickly bought the same lamp. Also, I haven't turned it off for 2 years and it still worked, I couldn't ask for more.
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