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So if say you used the lowest (speed 1) primarily, the total draw is relatively low, and while pwm would gain a lot in terms of %, the total amperage, or wattage to be saved would be very small. The real gains to be had with pwm would be if you use speeds 2 or 3 commonly. If you only used speeds 1 and 4 it really wouldn’t matter whether you had pwm or not
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