Added 2 more channels, Replaced Yellow with warm white and violet, a bit more wattage, tweaked style lens and 'micro fins'.....
Yeah, it was time for Ecotech to push something new in, but the tech/innovation-wise was fairly MAXED out by Gen 3. So the new stuff is nice, but nothing to be extremely hyped up about.
Gen 3 Pro is solid and has been WELL documented with thousands and thousands of successful Reef.