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Technical Precision Replacement for Osram Sylvania Dulux S 13w/21-840 Light Bulb 13W PLC Fluorescent Light Bulbs - T4 Twin-Tube U-Shaped Bulbs - GX23 2 Pin Base - 4100K Cool White - 2 Pack - 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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