The 90 degree beam angle means that there's lower par and visual brightness around the outside of the fixture. Again not that big of an issue because I'm going to use plants that can adapt to lower light in these spots.
Nice lights, easy to install, easy to use.
The same fixture could be built for around $100 for a single 18" model, or around $200 for two if you use the same diodes provided in some diode layouts floating around for these lights.
SBReef were "rumored" (only putting it that way because their website is sometimes lacking esp for FW lighting.) to use mixed optics..
90's around the perimeter and 120's around the middle on "some" diodes.
W/ these cheaper optics not sure there is much of a real difference between the 90's or 120's and frankly during assembly in China not sure they really care what they throw in.