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[APD] Watts per Inch

I notice that unlike most incandescent light bulbs, PCF bulb sizes seem to be in some sort of proportion to their wattage - a 96W bulb is about 34", a 55 is about 21", and a 13 is about 7". Is it roughly correct to say that each inch of PCF bulb gives off approximately the same amount of light?

I am looking for an estimate, not exact numbers.

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