KASTLITE T8 Fluorescent Light Tube Guard with End Caps, 46-3/8″ Fluorescent L… on July 20, 2026 July 26, 2026 Manufacturer: KastLite. Bulb Shape Size: T8. These 4ft fluorescent light bulbs sleeves evenly diffuse light, enhancing comfort in any space. Light Type: Fluorescent. Unit Count: 24.0 Count. Bulb Base: G13.