This guy writes a good comparative review. Just putting some excerpts here, if you want to read it all, follow the link. General gist is more power, higher output, better PAR, better color, better fans, more "natural" colors. Sounds like a win win win. And if you are going to drop $650, what's another 100 for the best possible light on the market? Also from everything I have read the cloud version of the ECO smart live doesn't cost $200. I can't find where it costs anything at all.
http://www.advancedaquarist.com/2013/1/review
The most obvious and significant improvement over the standard XR30w is the new LED array cluster. The Pro features eight more LEDs over the first generation XR30w and ten more LEDs over the second generation "G2" XR30w. (42, 34, and 32 respectively). Like the recently announced XR30w G2, the Pro now uses the new 5W Cree XT-E white and royal blue LEDs. The XT-Es are more efficient than the XP-E and XP-G bulbs they replace (and is consequently why the XR30w G2 requires two less bulbs than the first generation).
The additional LEDs are comprised of two 3W Osram Oslon SSL Yellow diodes (590nm), four 2.5W SemiLEDs "Indigo" diodes (415nm), and four 2.5W SemiLEDs "UV" diodes (405nm). The 590nm diode - a spectrum bordering between yellow and orange - is centered on each of the LED cluster arrays and was chosen by the Ecotech design team "to provide a more rounded spectrum" according to Tim Marks.
The indigo and "UV" diodes warrant a paragraph of their own because few aquarium LED fixtures include sub-440nm "royal blue" spectra, and those that do often output only token amounts. The Pro, on the other hand, includes a class-leading 20 watts of sub-440nm light. Ecotech Marine recognized that lower wavelength bulbs are less efficient so the Radion would require a substantial number of sub-440nm LEDs to produce meaningful light in this spectral range. Thus, Ecotech Marine engineers added eight 2.5W LEDs to provide the bottom end of the spectrum.
The four 415nm "indigo" LEDs are a close approximation to the tried-and-true 420nm actinic fluorescent lights reefkeepers have used for decades. The 405nm LEDs are technically not UV (UV is defined as spectra between 10-400nm) but extremely close. The four 405nm LEDs extend the Pro's combined spectrum to encompass nearly the entire 400-700nm photosynthetically active radiation (PAR) range
Beyond the new yellow, indigo, and "UV" LEDs, you will also note the new white XT-Es produce a warmer colored white light compared to the previous white XP-Gs. Both LEDs are marketed by Cree as ""cool white," yet they look visibly different. You can also easily spot the design difference between the older royal blue XP-Es and the new XT-Es.
The Pro also employs a redesigned "water-resistant" fan, which operates at approximately the same volume as the original Radion. The top acrylic panel (including the touch controls and mounting points) remain exactly the same as the standard XR30w
Using our Apogee Quantum Meter, I measured the the PPFD 36 inches directly under the center (in between the pair of LED clusters) of each Radion fixture.
Original Radion with original reflector measured 98 μmol m-2s-1
Original Radion with TIR lens upgrade measured 118 μmol m-2s-1
Radion Pro measured 144 μmol m-2s-1.
These results tell us the Pro is significantly brighter than the original Radion (even with the TIR lens upgrade):
+46.9% more PPFD vs original Radion with original reflector
+22.0% more PPFD vs original Radion with TIR lens upgrade
I will conclude my review on a personal note: I found previous LED lights (including the first generation Radions) lacked the power or color rendition to replace my trusty 250W metal halide and lumenarc III reflector system used over my 176 gallon reef. The Ecotech Marine XR30w Pro is the first LED unit to impress me enough with both its light quantity and quality that this reviewer has finally decided to make the switch from MH to LED.