7w Double Ended UVC Bulb T5 for Green Genie 2500 - BOGOF. About the 7w Double Ended UVC Bulb T5 for Green Genie 2500 - BOGOF ADD ONE 7W BULB TO YOUR BASKET AND RECEIVE TWO!!! This 7w double-ended bulb is compatible with the Lotus Green Genie 250 box filter. Specifications and pricing on this page reflect the data published by the source retailer at the most recent catalog refresh. Verify the current listing on the retailer page before purchase.