40w Double-Ended UVC Bulb - BOGOF. About the 40w Double-Ended UVC Bulb - BOGOF Manufacturer: UVC Bulbs ADD ONE 40W BULB TO YOUR BASKET AND RECEIVE TWO!!! This double-ended 40w UVC bulb fits the Lotus Clear Pond 80. 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.