A recent Economist carried a piece about how maybe the increasing efficiency of light bulbs is not going to lead toward a reduction of electricity needed/produced.
It is worth remembering that when gas lights replaced candles and oil lamps in the 19th century, some newspapers reported that they were “glaring” and “dazzling white”. In fact, a gas jet of the time gave off about as much light as a 25 watt incandescent bulb does today. To modern eyes, that is well on the dim side.
Do you think you will be wanting brighter lighting in your house/office/church/store if five times the lighting takes half the electricity?