Is there such thing as an electrical relay that has variable output voltage based on input voltage?

For example, let's say the voltage send throughout the relay is between 0 and 20V, and the voltage used to activate the relay is between 0 and 5V. Is there a type of relay that, when 2V is input, 8V is out put, or when 4V is input, 16V is output?

I'm looking to be able to dim lights remotely.
3 answers 3