Each LED has it's own resistor, so you can control brightness individually.
Pins for each LED are oriented so you can either stand the LED straight up or bend it over to radiate out over the edge of the board.
Each LED is 45 degrees from each of its neighbors
Power can be applied in either of two ways:
There is a 5 pin header in the middle that could accomodate a USB breakout board (see kit for example) or just connect at "+" and "-"
Along the edge between LED8 and LED1 are two 2 pin headers (0.1 inch pitch) 15 degrees apart with the "+" connection towards the center
There are 4 sets of 2 holes 15 degrees apart like the power headers. This was added for the "Tower of Flower" or in general so you can stack these boards using spacers either lined up or rotated 15 degrees. The two pin power connectors were done the same so you can pass power from one board to the next.
There is a center mounting hole should you need it.
Image above is just one possible configuration. Choice of colors and brightness are up to you.
Boards are sold as single units with discount for multiples.
Schematic is above
There are 8 LEDs in parallel, each with it's own resistor
There is one main power connector in the middle (5 pin header for micro-USB breakout board, but + and - are labeled) and two passthrough (or main) power connectors along the edge between LED8 and LED1.
Board traces are 1mm wide. This should be able to carry around 1 amp, but it is up to you to make sure it will work for your application. Wider traces were added because boards might be stacked so we need enough capacity for the first board having a power connection.
Layout is above (Front on the Left)
Board is 50mm diameter by 1.6mm thick
One 4mm mounting hole in the center
4 sets of two 3mm holes 15 degrees apart (the four sets are 90 degrees apart) at 21.5 mm from center (3.5mm from edge). These were added in pairs so you can stack and offset the boards by 15 degrees each.
The two power connections near the edge are also 15 degrees apart so you can pass power from one board to the next.
The 5 pin power connector is 7mm from the center
LEDs are 21mm from center (4mm from edge) and 45 degrees apart
Resistors are 16mm from center and also 45 degrees apart