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Fluorescent T8 vs. T12 Bulbs (with Pictures) | eHow
How can I tell whether a fluorescent ballast is T8 or T12? - Home
Fluorescent T8 vs. T12 Bulbs (with Pictures) | eHow
Fluorescent Light Bulbs T8 Vs T12 | Americanwarmoms.org
Fluorescent T8 vs. T12 Bulbs (with Pictures) | eHow
T8 Versus T12 Light Output | Decoratingspecial.com