Hi Tops, did you try increasing the power supply voltage (VCC)? At 5V the LEDs are pretty dim, it works better at 7V+. The LEDs are still multiplexed by rows using the default firmware, so they will not be driven to the max possible power. If you only have a few LEDs to drive (up to 24 or 8xRGB) look on the Seedstudio blog for the large seven segment display demo program which doesn’t multiplex.