This looks so neat. It’s basically a large area LED lamp that comes in convenient kit form to create a circular light source up to 12″ (300mm) in diameter. The slight downside is that it’s live at mains voltage when lit.
The driver IC is slightly perplexing. It’s a three pin buck driver that uses a choke/inductor to control the current through the LEDs, but having only three pins it still somehow manages to get a reference across a sense resistor to the negative rail. Possibly with clever circuitry that gets that reference while the internal MOSFET is off and there is no current flowing through the resistor.
I’m guessing these lamps are intended for use inside circular metal light fittings where you install it in place of something like a 2D or circular style fluorescent lamp. The case has four small magnets on the back, and also two screw holes. In a fitting where they are screened from touch they will be fine, but in the open where humans or animals could be attracted to the device they pose a shock risk if contact is made with the LED solder connections.
On the basis that they are really nice and just begging to be played with or used as a wall ornament, this is a bit of a shame.
These came from Banggood, but note that they are intended for around 220V operation. That said, the circuitry looks like it may accommodate 110/120V supplies, although the 20 and 24W units may be pushing it a bit as it will rely on the peak voltage on the main electrolytic to run the LEDs.
Update. I tried the light in a 120V shaver socket and the 24W unit flickers, but stops when just one of its panels is changed to a three LED one. So the 20W unit may work on 120v, but the 12 and 16W units will probably be fine.
If you are fully aware of the voltage and safety limitations, then the link for these is:-
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