The LED series/parallel array wizard is a calculator that will help you design
large arrays of LEDs. The LED calculator was great for single LEDs--but when
you have several, the wizard will help you arrange them in a series or combined
series/parallel configuration. The wizard determines the current limiting resistor
value for each portion of the array and calculates power consumed. All you need
to know are the specs of your LEDs and how many you'd like to use.