If I have three led bulbs on a dimmer is the circuit using less power when they are fully dimmed?

 

Yes

 

Consider that the light output of an LED is proportional to the power input. Not always a linear proportion, but always a direct proportion.

 

Consider that the light output of an LED is proportional to the power input. Not always a linear proportion, but always a direct proportion.

So I'm not losing money paying for electricity being converted to heat in the dimmer?

 

So I'm not losing money paying for electricity being converted to heat in the dimmer?

I think the dimmer only loses a couple of watts. Not 1/2 the total power.

 

Consider that most dimmers only get very slightly warm, they are not wasting much power, especially with an LED at low power levels. So the dimmer is not absorbing power, it is blocking it.