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Huh ? You can use whatever units you like for any capacitor, pF, nF, uF, etc.
The original Motorola ballast schematic I've seen used 10uF AC capacitors. They need to be rated for 125VAC or better. When I did the math myself, I found that 8.2 uF is better for modern line voltages of around 120 VAC. I've built them with both values and they work very well.
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