FREE SHIPPING! on the DULUX 13 Watt Single Tube compact fluorescent lamp with 2-pin base, 5000K color temperature, 82 CRI, ECOLOGIC for use on magnetic ballast - CF13DS/850/ECO, model number 20309, by Sylvania. Use coupon code "clearance" for an extra 5% discount DULUX 13W single compact fluorescent lamp with 2-pin base, 5000K color temperature, 82 CRI, ECOLOGIC for use on magnetic ballast CF13DS/850/ECO 7.1" GX23 BASEANSI CODE: CFT13W/GX23/850Bulb Base: GX23Watts: 13Bulb Shape: S (T4)Case Pack: 50Filament: N/AAvg. Life Hours: 10000MOL (max overall length) 7.1Light Color: N/AColor Temp: (kelvin) 5000CRI Index: 82Cross References: Sylvania: 20309 or CF13DS/850Philips: 26216-2 or PL-S 13W/50General Electric: 11671 or F13BX/SPX50/850