AmericanDJ LL-F40BLB 40W Blacklight Replacement Tube

The ADJ LL-F40BLB is a 40W blacklight replacement tube for UV fixtures, the higher-output sibling of the 20W version and the one used in longer bar-format blacklights.

UV output degrades with hours run well before the tube fails outright, so a fixture that looks like it is working can still be underperforming. Replacing the tube restores the wash. ADJ catalogues it under Replacement Lamps as part number LL-F40BLB.