Well that's what the chart in his S200Cvn review said...
The chart has a note saying he tests at 10 meters.
A clarification that might help:
A light's cd is its throw at one meter, in lux, but NOT its ACTUAL throw at one meter....it back-calculated throw at one meter.
So, as per ANSI, you COULD measure at 1 meter too, but, it also lists other measurement distances, and, you are supposed to select a distance far enough away for the light being tested. Throwy lights typically have beam shapes that are not fully formed for several meters...so a measurement closer up will not be as intense, and not yield the full cd.
So, as you get farther from the light, your lux meter gets lower and lower lux readings, but, when you do the math to back calculate the light's cd....the cd will be going UP as the actual lux at each progressively farther distance goes DOWN.
At a certain distance and beyond, the lux still drops, but the back calculated cd remains the SAME....and that distance is "far enough". IE: Going farther away doesn't get you a higher cd, so, the beam is fully formed, and, you can now USE the cd to calculate how much lux will be on a target at any given distance beyond where the beam has fully formed.