This 2 Pack PLC 13W 3500K 4 Pin G24Q-1 13 Watt Double Tube CFL Light Bulb is the perfect replacement for Sylvania 20671 CF13DD/E/835, Philips 38327-3 PL-C 13W/835/4P/ALTO and GE 97596 F13DBX/835/ECO4P PLC13/4P T4. It has a 3500K white color and a 4 pin base. It has a 900 lumens light output and a 13W bulb with a long-lasting 12,000 hours average lifetime. It is a compact fluorescent light bulb with a 4 pin (G24q-1) base type and an 82 CRI. It has a 5" length.