The LEDs are only 20ma per channel. The leads are designed to stand the LED off the board by a few mm, air cooling seems to work fine. The A6281 definitely needs heat sinking, I have the thermal pad connected to a large ground plane and that seems to do the trick. When the thermal pad is not connected, the A6281 hits overtemp and shuts off one of the LEDs. It automatically turns back on when the heat issue is resolved...no need to worry about burning these out!