Re: help please
I cant decide between solarforce m9 or armytek baraccuda for distance of 200m I know it says 500m but what is usable distance, cheers fil7
Usable is in the eyes of the user...in other words, what you need to see at a range will dictate what light level is adequate.
For example, you want 200 m of usable range...
If you use the ANSI 0.25 lux on target to decide, it says a light rated at 10,000 cd (10k cd) would give you 0.25 at 200 Meters.
If you wanted to see that your beam was on something, but not what it was on, that would be a bare minimum.
If you wanted to see if a man in a white suit was out there, you might need closer to 0.5 lux, and therefore closer to ~ 20k cd.
If you wanted to tell if the man changed into a brown suit and was still there or not, or if he had a dog, etc, you might need closer to 5 - 15 lux to spot him...or ~ 200k - 600k cd....a big jump.
If a light gives ONLY its ANSI range (Range to 0.25 lux), then you just take HALF of that in meters, and square it, to get the cd.
So if a light lists 500 M as its ANSI Range, take 250, and square it, to get 62,500 cd.
62,500 cd would be enough to put about 1.5 lux on something 200 M away.
What are you wanting to be able to see?