Hi,
You really have to put that AC idea away. The poster was talking about the UK. In the UK, air conditioning is something we have in server rooms, meeting rooms and cars. I don't know anyone here who has AC in their house. In fact, you have to call it "air-conditioning", because if you talk about the AC, people here start thinking about the mains supply.
We have warm-ish evenings in summer, but mostly by the time the lights go on, the temperature has dropped enough for you to wish there was a little heating on. I never bother to turn the heating on specially, but that doesn't mean that a little extra light-bulb heat isn't wanted. There is a summer every 25 years when it's warm enough for this not to apply!
In cold places, light-bulbs are about as good as any other form of electric heating. Even the thing about convection optimization is fake - all room heaters heat the ceiling first and fill downwards, and light-bulbs just ensure that the ceiling fills quicker.
In one way, light-bulbs are better than other heaters - they are generally likely to be on only in rooms that are in use (assuming you are careful about leaving lights on). Most central heating systems don't do that.
Cheers!