A look at an odd LED panel that uses an SM2087 chip.

This is quite an unusual LED array that can be run directly from 240V mains with just a rectifier, SM2087 chip and a current setting resistor.
The circuit uses a technique that involves progressively switching in sections of LEDs in series as the rectified sinewave voltage ramps up and down.
It seems to use a series of current threshold levels as the combined forward voltage of each circuit of LEDs is reached to switch the sections in.
There’s a data sheet that may take an unusually long time to download, but it is missing a block diagram of the chips internal function.

The LEDs on this panel are all 5050 housings with three white LEDs wired in series to make up a large array of series LEDs.

Contrary to the sample circuit given on the data sheet, this module has a 100nF capacitor tacked across the rectifiers output.

Note that these panels which seem quite common on eBay do seem to require heatsinking, as their rated power is 7W.

The ebay link to this module. Note that it is for 220V use.