I've had some WS2803 chips (like WS2801 but 18 channels) sitting around for ages now so thought I'd come up with a use for them. There are 6 RGB 5050 style LEDs arranged in a 50mm circle with the pixel chip in the centre. Input and output connections for (5V) power, clock and data are down the bottom. The overall size of the PCB is currently 70mm, but I may increase that a little to fill the 90mm (I/D) storm water caps I intend on using to house these boards. The idea is to build the board, attach wiring, test it then spray with a conformal coating. The coated board will be exposed to direct rain, but (hopefully) not be affected by it. A dob of silicone will hold it into the PVC cap. The general idea is to keep the cost down. I'll get a few made on the next prototype board run and see how the effect turns out.