AcroporAddict
There is no substitute.
The Reefbuilder's blog posted about these, and they alone are supposed to increase the Radion's light output by 30% without any additional modifications simply by dropping them into the unit (also replaces the splash guard). There are also 4 additional openings in the TIR lens vs the old one, and RB speculated these were for new LED pucks with 4 more LEDs. But instead, since the TIR stands for Total Internal Reflection, couldn't the 4 additional openings just be outlets for some of the additional internally reflected light to be directed downward, and not necessarily a lens for more LEDs?