Phil,
That comparison was done with one of our wide angle lens Sunspots. We were unaware that they were going to do that sort of a comparison, or we would have provided our narrow angle lens version to them. We have recently sent a narrow angle version of Sunspot to Paul at Avweb/Aviation Consumer and I believe they are going to redo the comparison in the near future.
They are basically comparing an LED taxi light with landing lights. The narrow beam version is more suitable for use as a landing light. The Sunspot puts out more lumens than the GE4509.
Dean Wilkinson
CTO, AeroLEDs LLC