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Lifegard Aquatics Replacement Lamp for QL Series UV Sterilizer - 40 W Pillow Beds It is one of theReplacement bulb for the 40W QL Series UV Module. Ultraviolet light bulbs lose their effectiveness over time, the same way fluorescent bulbs lose their color spectrums from continued use. UV bulbs should be replaced every 8 12 months for the most effective sterilization and clarification of your water.