Yes these are Luxeon Star white LEDs. They are rated for series operation, and the combination I planned is one of those suggested by Lumileds.
One of the drivers have PWM built into it. Since I don't have enough knowledge yet on PWM, here is the link to the datasheet of the driver...
I am making a high intensity LED light panel for my aquarium. I got 15 1w Luxeon white LEDs rated at 350mA max continuous current and 3.42V forward voltage.
The LED driver I am planning to use is Xitanium LED-120A-0024V-10F. Here is a link to the datasheet...