The electric companies "sell" electricity folks, it's their commodity, they want to sell as much as they can, it makes people happy, there called investors. But your really comparing apples to oranges. Swapping all those lights is beneficial and saves, but generally those type lights are not on very much. I would worry more about the electronic signature than the consumption. 2K or 4K watts switching on and off every 12 hours leaves a pretty reliable indicator.
But that's only if law enforcement has access to it, and if they do I'd say you were screwed long before they got access to that information. If the signature makes you nervous you could use two flower rooms and use a switch that runs both light off the same ballast. Pretty continuous flow of current with little if any signature.
In the case above, 2k could be split and run continuously, probably with other crap pulling 1.4k 24/7 instead of something like 2.4 12/12.
I simply wouldn't worry much about consumption. Other than the electronic signature mentioned above, think of all the crap people buy now that consumes electric. My friggin hot-tub uses like $60 a month alone.
Just write 'em a check and don't worry about it.