My thinking is that we should look at the electricity usage rather than the subset of electricity used by lighting, since the bill going down because of lighting means the bill can go up because of something new.
Oh yes, I agree with the general point, that the Jevons non-effect in lighting is canceled by the Jevons effect in general energy usage, and that we can't expect energy efficiency improvements alone to reduce the latter.
So there's an important point here: the benefit of energy efficiency improvements is not that it will get total energy usage down by itself (and thereby hit GHG targets), but rather, that it will reduce the total hit to consumption/utility that we experience when regulations disincentivize (GHG-emitting) energy usage.
