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Resources. User guides and spec sheets for Feit Electric products Jan 27, 2020 · Now, you need to purchase the correct replacement bulbs. Always choose the brand of bulb that matches the brand of the ballast, which means, for example, a GE circline fluorescent ballast replacement bulb needs to also be a GE brand. Bulb wattage and outside diameter are also important. Jan 27, 2020 · Now, you need to purchase the correct replacement bulbs. Always choose the brand of bulb that matches the brand of the ballast, which means, for example, a GE circline fluorescent ballast replacement bulb needs to also be a GE brand. Bulb wattage and outside diameter are also important.