This Sylvania 21137 lamp is a replacement for the double fluorescent lamp in a Panasonic bathroom fan. The original Panasonic lightbulbs were fantastic, instantly on and no flickering. Unfortunately, these lamps are no longer available. I have tried other similar twin tube bulbs but the flickering was terrible. This Sylvania lamp will flicker, but only 3-4 times before fully illuminating. It's not perfect, but it does the job. If I have to buy another replacement it will be this bulb - or I'll try an LED.
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