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At what power factor do commercial 4 tube fluorescent fittings usually operate or can they vary?

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It varies based on the ballast. Most ballasts nowadays are "power factor corrected" to try and compensate for the bad powerfactor in switching power supplies. The actual power factor of a individual fixture is entirely dependent on the circuit of the ballast, which changes from design to design.
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What is commercial power factor?

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How much area will a 2 tube 4' fluorescent light fixture cover?

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What is the use of fuse in fluorescent tube?

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How do you fit a starter on a fluorescent tube?

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