Yes, the ones in moonlights are lower power.
Moonlights usually use something on the order of 1w LEDs. The ones in the solaris, PFO, etc are 5w LEDs.
A "bit" more for the LEDs is understated. Expect to pay $5-10 per LED in quantities of a couple hundred (you'll need about that many to build a system). You can get them on that famous site where you bid on stuff for much less, but it's often factory seconds. The cost drops hugely when you are a manufacturer like PFO that buys them in massive quantities.
The Luxeon LumiLEDs, Cree LEDs, etc are the ones you want to be looking at.