Perfect, this is exactly what I needed to know. I'll try to take some readings tonight when I get home. I'll have to convert feet to meters first though since I'll be using a tape measure to see what the furthest distance in my basement is :)
Is there a variable I can throw in for cat dander in the air? LoL
There is indeed a difference if air is not clean or humidity is high, but that's not nearly as big of an error impact as measuring at too short a distance & end up measuring at the convergence/divergence junction. Worrying about air quality is like splitting hairs now for typical flashlight lux measurements.
Unless, one is going for world record, then go up to the mountain where observatory is & measure it from a mile away :)
I repeated the measurement again at 6.74m
75mm aspheric 3600lux ~163klux at 1m
66mm lens 2100lux ~95k lux at 1m
C8 xml 310lux ~ 14k lux at 1m
Tiablo R2 1700lux ~ 77 lux at 1m
So it seems like aspheric lenses are if not statistically better, they are not doing worse at 6.74m than 3.17m, but C8 with a reflector is doing worse as expected. I guess it could be that the lens focuses at longer distance better.
Ok I did my tests at 5 meters.
P60 SMO XP-G - 5,500
Sipik Clone Zoomie - 6,750
P60 SMO XM-L - 12,000
X2000 Zoomie - 14,250
Nitro's P60 aspheric kit with XR-E R2 - 14,750
Stock 2D Rebel Mag - 21,250
52mm Aspheric Mag XM-L - 61,250
Fun hey, knowing what they do 
!?
Could you please measure the lux @ 1 meter distance from the bare led?
So without the lens? Hope you can screw the bezel of from the 66mm and 75mm flashlights…?
That would be very interesting. It would give insight in what lumen is coming from the led, and then in turn how good the lens is.
It would make it easy to predict what candela you would get with a comparable set-up.
Its also a good way to evaluate a lens with the formula for throw.
I am working on a 75mm aspheric and XM-L at 3 Ampere.