Recessed Double Contact (RDC)
T12, 1 1/2 inches (38mm)
6-foot “FSX” High-Output UVB-Broadband
Fits only National Biological Corporation 6-foot UVB-Broadband devices. Note: Philips does not make a UVB-Narrowband version of this bulb type, but it is possible to change these NBC devices to accept standard RDC in-line endpin type bulbs.