Sudden schematic of a slightly different LED festoon lamp.

Although supplied in an identical box to the ES version of these festoon-style LED lamps, this one has slightly different circuitry.
The ES version of the lamp had a ring of diffused LEDs wired as two inverse parallel strings with a capacitor and resistor in series, but this one has a cap, rectifier and some smoothing. There's also a series resistor in line with the LEDs, and to accommodate the small amount of space on the PCB it is mounted mid-way through the circle of LEDs. This means it can go in any available space on the PCB.
The white LEDs themselves are an unusual size that looks like 4mm diameter, and are clear lensed LEDs. Unfortunately this means they project quite a hotspot of light onto the front of the lamp globe.