Here are two boards that share the same electrical schematic. In the upper left hand side, is the board laid out for easy evaluation. This evaluation card allows the user to very simply evaluate the application. Notice that the LEDs can be strung together in series and this board is capable of driving from one to four LEDs in series. The layout shown on the lower right hand portion of the slide is the same circuit as the one in the upper left hand. It has simply been laid out and optimized for use as a round board with a 1.8 inch diameter -- something that might be used for a screw-in incandescent replacement.