I like the socket idea, but wiring the bulb in series with the battery and motor, will add the resistance of the bulb to the circuit and it will reduce overall current flow. It will split the available battery power between the light and motor. The drop in current flow will make the battery last longer.
If you wire the bulb in parallel with the motor you will reduce the battery life and it will have much less of the desired effect to reduce motor power(unless you choose a high power bulb that draws so much power from the battery that it drops the voltage but that will drastically reduce battery life.
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