Sparrowhawk, I have one of the LED lights to test. I have not mounted it or done any tests yet. I am working with a retired friend of mine to build a test fixture for easy fixture comparisons. He has been in the lighting business since they invented candles and has lectured at MIT as well as working with major lighting manufacturers.
We have a plan but it is taking a bit of time to get everything together. And my budget will not allow for top line test equipment. However we should get something with accurate and repeatable measurements to allow comparison between different fixtures. Unfortunately, its not as easy as just measuring light output.
I will post a full report (probably in a different thread) when we get done. Until then, Cheers.