Those seem to have resistor built in every bulb, so even one of them will stop flickering in roof lamps. Boot light seems to be on another circuit, but if bulb has resistor built in, it will not flicker. My LED-s were not meant for cars only, so no resistor in them. Rear roof light had cheap automotive LED-s already in them, they flickered too.
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This one seems to have 330 ohm resistor installed and that makes 0,4-0,6W per bulb to power resistor only. In specs there is written: Wattage 2,4W and in Product description is 2W, so seems right. My boot got 1W LED that has higher light output than this 2,4W one (in reading lights went 0,36W). So half of my entire LED power goes to that resistor. To stop flickering 8,2k resistor was enough for me, and that makes extra 0,017-0,025W per light.
But not everyone uses soldering iron to add resistors and not everybody cares about extra watt or two per lamp ...
That explains it then, didn't realize that was part of the bulbs, ones i have do not have visible resistors just pretty nice heatsinks. I've got flasher relay to modify as i am aware that goes wonk if LEDs are fitted.
Would be interesting to see comparison of LED headlights, I've got some off amazon for 35£ and they work great - a pretty big improvement over bulbs however light pattern is not completely even. Other than being a nightmare to fiddle into place with clips in the audi it is lovely.