The best replacement for t12 bulb is t8.

The best alternatives to t12 bulb are rated as following:
★★★★★  t8
★★★★★  t8 bulb

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Speaking about t12 bulb, one probably shouldn't forget about t8 ballast.

Other search terms related to t12 bulb and their ratings are:
★★★★★ t8 ballast
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