Kaiser Dulux Fluorescent Lamps 203454 Power: 55 watts. Color temperature: 5400 Kelvin. CRI: 90 - 100. Socket: 2G11. Light color: 12. Average service life at steady color temperature: 8000 hours. Length: 21 in/533 mm. Tube diameter: 2 x 0.69 in/17.5 mm. Compatible with Kaiser Model: (203425/3428) and (203431). Please replace fluorescent lamps as a whole set if requirements for color-correct lighting are high.