Those are kinda shit, though. Also, the ones you're thinking of should be capacitive dropper circuits, if I'm not mistaken. There's also the electrolytic-smoot

Those are kinda shit, though. Also, the ones you're thinking of should be capacitive dropper circuits, if I'm not mistaken. There's also the electrolytic-smoothed bridge rectifier variant. BigClive has a lot of teardowns of such light bulbs (and non-bulb-shaped alternatives) with circuit diagrams and explanations. They're really good for learning about the various "cheap LED bulb" designs.