Sylvania 20667 Compact Fluorescent 4 Pin Double Tube 4100K, 13-watt, White on July 16, 2026 July 22, 2026 Model Number: 20667. Manufacturer Part Number: 20667. Light Source Type: Compact Fluorescent Light (CFL). Included Components: Compact Fluorescent Bulbs. Color Rendering Index: 82. Bulb Shape Size: T4.