T8 Fluorescent Light Bulb 18W 26in 4100K Cool White G13 Medium Bi-Pin 1 Pack on July 16, 2026 July 24, 2026 Bulb Shape Size: T8. Bulb Base: G13. Light Type: Fluorescent. Light Source Type: Fluorescent. Connectivity Technology: Normal bulb. Color Temperature: 4100 Kelvin. Special Feature: High Efficiency, Instant On.