Here’s the raw data measured by Emrhys Barrell, on which we based the recommendations in our gear test in the September 2012 issue of Yachting Monthly
When looking at this data, it’s important to note that a lux meter is designed to detect white light, not red and green. This could explain why the readings for green were so much higher than those for red for all lights – because green is in the middle of the visible spectrum and red is at the end. In our test, both red and green were equally visible from a distance of 1nm for any given light.
These LED tables are too wide to fit on this page but they are available as free pdf downloads.