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Look again at the Philips page. I think you made a mistake when reading. It says "PF5B", not "FP5B." I think "PF" stands for their trademark "Photo Flux," or "Photo Flash," not "Focal Plane."
The light curve for the PF bulbs is very peaked, not flat-topped like a focal plane bulb.
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Old TV literature, New York World's Fair, and other miscellany
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