Nate 33, I think you are right in this, but only in the case that you heat your house with electriciity directly
The energy savings is close to zero for 3-9 months a year (depending on the climate).
Although a few countries have abundant, fossil-free electriciity (like Norway has hydro) and therefore heat their houses with electric radiators combined with thermostats, this applies to very few worldwide.
If you heat your house in any way that is cheaper or more eneryefficient than electric radiators, the heat from lamps is mostly a waste.
There are also today some houses built that are supposed to be superefficient and so well isolated, that you supposedly need no other heating than what you get 'free' from appliances and cooking. In those houses I suppose you rely on the heat from your electric light also.
- And then of course there are summertimes with excessive indoor heat. It takes a lot more energy to cool air one degree than to heat it one degree.