Thats rather nitpicking don't you think? With LED lighting that really doesn't represent a huge amount of fossil fuels being consumed. Their private jets and huge cars would be the real culprits to point at.
What about manufacture, shipping, retailing, setup, removal and storage?
Are you telling us none of that takes fossil fuels?
Too often people try to reduce the scope of arguments to just the small factors that can be used to argue a point. The bigger picture has to be pointed out every time.
This is not a hypothetical, so I can see why you were hyper-focused on the amount of electricity needed to operate the lights apart from any other facet that also impacts Climate Change.
BTW, the cost to operate that many LED lights is not tiny. 5 strings of 100 bulbs each of C7 medium LED bulbs can use an average of 45kWh per month. Figure out how many bulbs are being used, and the kWh total is easy to calculate.
The point is, it's not zero, which is where they say the rest of us should be closer to. It's not a crisis if they do this.