It would be spectral class M
hope this helps
The generator/dynamo<span> is made up of stationary magnets (stator) which create a powerful magnetic field, and a rotating magnet (rotor) which distorts and cuts through the magnetic lines of flux of the stator. When the rotor cuts through lines of magnetic flux it makes electricity.</span>
This is most likely because a heated mirror will evaporate any water condensation from the shower that tries to accumulate onto it.
