Fluorescent Tubes Gary Baker May 9, 2019 • 2 min read Fluorescent Tube Finder Please click on your required type of fluorescent tube below. 7mm (T2) Diameter View light bulbs with a W4.3 lamp base. 12mm (T4) Diameter View light bulbs with a G5 lamp base. 15mm (T5) Diameter View light bulbs with a G5 lamp base. 25mm (T8) Diameter View light bulbs with a G13 lamp base. 38mm (T12) Diameter View light bulbs with a G13 lamp base. Monopin View light bulbs with a single pin base. 2GX13 View light bulbs with a 2GX13 (2 Pins Either Side) G10q - 4 Pin View light bulbs with a G10Q (4 Pins In A Square)