Teardown of a 2-filament LED lamp with ridiculously simple circuitry.

I bought the small base version of this lamp purely to see how they crammed the circuitry into such a tiny area. The answer was by using the minimum number of standard sized components possible. Just four, and to be quite honest they could have left one of them out.
The circuitry is basically the simplest possible capacitive dropper with a capacitor (330nF), discharge resistor (220K), bridge rectifier and an extra resistor (150K) across the filaments to make sure they go out fully, as there is usually a small amount of capacitive leakage between switch wires in home cabling that results in enough current leakage to make LEDs glow visibly.
I'd rather they'd used one more resistor to limit inrush current, as the LEDs will bear the full brunt of it at switch-on.
The price the lamp pays for the simplicity of the circuitry is flicker. It's not noticeable to the human eye when viewing the lamp directly or it's surprisingly high output in a room, but it's detectable in peripheral vision and when you move your eyes rapidly while looking at it. I'd estimate it's lit for just a third of the mains sinewave.
You may note the delight in my voice at how they put all the circuitry on such a tiny PCB with just one main component on each side. This minimalist circuitry is very typical of what can be done with these new LED filament lamps where the LEDs operate at high voltage and low current.
The measured power of the lamp was about 1.6W. It put much more powerful LED lamps to shame with a good level of even illumination in the room.