Hey Ross do not know if you have seen this

http://www.saltysupply.com/MaxSpect-...es-s/14207.htm

I did not realize there was such a big difference between the P and S series Also looking the voltage and amperage you are looking at 80w for P and 75 for S series. The biggest difference will be with S you only get white blue and purple colors, with P you get a few more plus they are using better quality LEDs.