4w Lamp fits Green Genie 2000. 8w Lamp fits Green Genie 3000. 16w Lamp fits both the 6000 & 12000 Green Genie. 25w Lamp fits Green Genie 24000. High Quality Arcadia UV Bulb. A UV bulb should be replaced every 6 to 12 months to ensure optimum performance and clarity.
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