20W T10 lamp - 23.25 Inches Long Cool White The FL20SW/RS/CWL/JPN is a T10 fluorescent lamp with medium bi pins, 23.25 inches long. This lamp is a replacement lamp for the following part numbers. MATSUDA T10 20W CW, USA Light F20T10/CW/23, Panasonic FL20SSW/18 580MM MATSUDA 791407 FL-20T10CW