According to my Kill A Watt electricity monitor, the cellar garden experiment used an even 100 kilowatt hours of electricity in 61 days for an average of 1.64 kilowatt hours per day. My electric bill works out to about $0.145 per kilowatt hour once you count all the fees and taxes, so this experiment is costing me a little less than a quarter per day in electricity.
Were I to do this for real, I’d set up the lights differently and would probably get all eight pots to have the same amount of light the two end pots do now without using any more electricity. However, even that way, it probably still wouldn’t be worth it.