Decades ago, everyone used incandescent lamps for their homes (provided they had access to electricity). Each bulb was affixed to a 2-pin “bayonet-mount” socket, with just a slight push-in and a quarter-turn twist. There were two types, one with clear glass and the other with frosted glass. And they were cheap. I remember a 100W type cost something around RM0.30. We had half a dozen of 100W’s and some 60W’s in the house.
These bulbs had a nice warm white light but were not very bright, and they cast sharp shadows on walls — giving us kids fun opportunities to create animal patterns with our hands.