T4 GX23 2-Pin Twin Tube 120V Compact Fluorescent Lamp. 13 Watts with choice of Very Warm White 2700K color temperature, 82CRI. 800 initial/680 mean lumens, or 3500K Bright White color temperature, 82CRI, 800 initial/680 mean lumens. 2-Pin lamps are for use with magnetic ballasts. Minimum starting temperature 14 degrees fahrenheit. Idea for commercial applications, most commonly used in recessed cans, portables, ceiling fixtures, and wall sconces. Suitable for use in dry location enclosed indoor and outdoor fixtures. Average lamp life 10,000 hours. Length: 7.1 inch.