Also, what is so great about the SB90.2 LED? Convoy and Hank charge quite a lot extra for it.
It's a small light emitting surface relative to the amount of power it can take, i.e. it usually results in lots of output and throw. Companies charge a lot for it because it's expensive for them to buy. Looking at the layers of metal and glass and the 24 bond wires, it's probably expensive to manufacture.
The newer SFT90 costs a lot less and does about the same thing.