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6 Pack) PL-13W 841, 2 Pin GX23, 13 Watt Single U-Shaped Twin Tube, Compact Fluorescent Light Bulb, Replaces Philips PLS13W41 GX23, Sylvania CF13DS841 GX23 - Amazon.com
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Philips 146811 13W 2 Pin GX23 Very Warm White Single Twin Tube CFL Bulb - Compact Fluorescent Bulbs - Amazon.com
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