Satco 12W/20W/26W T4 LED Light Bulb - Medium Base - White Finish S7341 | Zoro
11W T4 Round Lamp Tube Ring Light Tube With 4 Pins LED 220V White Light Tube - AliExpress
12W 15W 18W T4 U Shaped CFL Energy Saving Lamp - China Energy Saving Lamp, Fluorescent Lamp | Made-in-China.com
Feit Electric 35-Watt Equivalent T4 G4 Bi-Pin Base Landscape 12-Volt LED Light Bulb Bright White 3000K BP35G4/830/LED/HDRP - The Home Depot
ML150 MAGNIFYING LAMP & OTHERS.. BULB is 4.75" OD, 3.85" ID - T4 6500K | eBay
Bulbrite LED Mini 35-Watt EQ T4 Warm White Candelabra Base (e-12) Dimmable LED Light Bulb (2-Pack) in the Specialty Light Bulbs department at Lowes.com
General F12T4/41K-435MM 12w T4 lamp CoolWhite (435mm / 17.126in)