That would be impossible to monitor, unless they have someone monitoring your electricity usage 24/7

It is not the police's job to monitor electricity usage. That is up to the electric company.

If you are using less than 2 x 1000W HPS lights, then I would say you are good, does not matter what cycle you use. 24/7 18/6 or 12/12 does not matter.

Right now is a good time to go up on your bill about $50, since it is summer, they will understand that people do use A/C units, so I would say it would look normal from a logical standpoint. If your bill went up another $200... that would be suspicious.