In article , Gary Coffman says...

The cold resistance of the bulbs might be too low to allow
soft start. Something on the order of 20 to 40 ohms sounds
about right for starting a 20 hp wound rotor motor.

How about some of those old screw-in heater elements,
that have light bulb bases, but are conical ceramic
with resistance wire wound around them, for old time
space heaters?

Jim

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