I finally got around to looking at this again the other day. I opened the case rand what I found looks like just two leds that seemed to have silicone holding them and the reflector in place. (The leds were mounted to small boards...but there wasn't anything else inside the case.) Each of my reef brites has two leds which appear to be wired in series.
I'm guessing that the two reef brights could be wired externally into some sort of dimmer(?) and then wired to a single power supply?
Not quite. If there is no driver internal to the fixture (the ones I have seen did, but they may have been prototypes), then you will need to use an LED driver to run them. For the small 2 LED units, you could use something as simple as a 700mA dimmable Buckpuck and a small 12v power supply and run the two units in parallel off the driver.