Nobody does it that way in screw-base retrofit bulbs, but there's a whole world of commercial lighting where constant current is pretty widely used. Drivers fr

Nobody does it that way in screw-base retrofit bulbs, but there's a whole world of commercial lighting where constant current is pretty widely used. Drivers from vendors such as Tridonic https://www.tridonic.com/en/int/product-finder/led-drivers?filterParams=category%3DPC_LED_DRIVERS%26OPERATING_MODE%3DConstant%2Bcurrent https://www.tridonic.com/en/int/product-finder/led-drivers?f... Advantages include lack of flicker and more reliable LED boards (hardly any components except for the LEDs). Drivers still fail, but it's nice to have them be a replaceable part.