My 3-way lamp switch will light up a 20-Watt fluorescent bulb on power settings #2 and #3, but not on power setting #1. How much power am I using on power settings #1, #2, and #3, if they are set to 15 watts, 45 watts, and 150 watts, and my bulb is a 20-watt fluorescent bulb that only lights up on settings #2 and #3?
What if the situation were the same, except with a halogen bulb used instead?
If I understand you question correctly, you are putting in a retrofit fluourescent bulb into a standard lamp with a 3 setting light switch.
You are probably using power on setting #1, but there is not enough power to have the ballast convert the voltage and ignite the gas in the bulb. But it is probably using energy constantly trying to light the bulb.
It is a different principle than an incandescent bulb where no light = no heat = no power.
I am not a total expert on the retrofit bulbs, but I would say if it is humming and the base above the socket warms up, it is using power.
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