There are actually only three Lumapad models. The 8000S and 4000S have 6500 Kelvin single color LEDS and the 6000D is the dual color LED model. All the different pledge levels are for the accessories such as WiFi card or light stand. Read through each pledge level to see what is included.
All Lumapads are open source so no matter which pledge level you get, you can still experiment and write your own code as long as you pick up the proper programming cables, Arduino software or other tools.