The 8087-2 light module was developed for Märklin locomotives of the Re 460 series, which are already equipped with LEDs.
Many of these models were equipped with yellow LEDs back then. With this circuit board they can be converted to white LEDs.
In addition this pcb has two more white LEDs for high beam and two red LEDs as tail lights in the lower left and right corner.

All LEDs are led over series resistors, so that the connectors can be connected directly to the decoder outputs.

The module has the same size as the original PCB and fits exactly in the same place as the original PCB.

This light module differs from item 8087 by two red LEDs at the bottom left and right.

8087-2 connectors (pads):
D+  Decoder Plus
0     A-light (together with connection 1)
1     Single LED white bottom right
2     High beam
R     Two red LEDs left and right

Decoder connections and wire colours (according to NEM standard):
Blue Decoder Plus return conductor functions
White F0 forward Light front (FL)
Yellow F0 backward light rear (RL)
Green Aux1 Function key 1
Purple Aux2 Function key 2

The light module is sold individually, you need two pieces for one locomotive.

Operation manual 8087