Although they work as advertised they only last about two years. In the 10 years that I have owned an aquarium I have replaced it about five times. Once burned out, they cannot be repaired (the bulb can be replaced, but the internal defect cannot be repaired). I have tried products from other manufacturers but they did not fit properly in my all glass aquarium. This is either a design flaw that will require you to buy a new lantern every two years, or simply poor production.
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