In the UK
For most of the year the "waste heat" of incandescents is quite beneficial. In that small Summer window when the warmth from the lights is not needed, the evenings are light until fairly late anyway so little need for lighting.
As we have transitioned to low energy lights I have noticed the wife making more frequent use of quick bursts of fan heater to top up the temperature in rooms where previously the bulbs helped keep the room warm. So electricity usage savings have not been hugely significant as bulb savings partially offset by increased portable heater use.
Obviously in somewhere like India that is a significantly warmer a lot of the time the heat is mostly waste.
Biting the hand that feeds IT
