It was a valid question as my stock tn31 will only effectively light up to about 350 while the claimed throw is a lot more than that.
I did order the neutral white for better colour rendition in my stock tn31, lol I'm a bit shattered to hear you say the cool may throw further lol.
I've a stock TN31 and I can see out over 700 yards with it. When I say "see" I mean I can see where there's a river running through the bog down the valley, I can see the outlines of lakes in the bog etc. I've no doubt at all that a foxes eyes would reflect at that range.
I've both stock versions, the cool white does indeed throw further. Only had the neutral white out one night - think a friend might be buying it - I wanted the TN31 just as a spotter so the tint LED doesn't make much odds to me.
For search and rescue, etc, I have found the tint hardly matters, as night adapted eyes can't see color really anyway...and overall, throwing further finds more than less throw with better color rendition.
For closer work, esp before adaptation, the tint can make things look better.
No idea about SAR work. I use mine for Search & Destroy :twothumbs Due to the land I shoot over, the farther out I can see a foxes eyes the better, we often need to reposition to take a shot and it's not easy ground to travel over.
The tint, well, I walked through a place that holds a lot of rabbits (surprisingly few foxes). I could see rabbits and their eye shine with the neutral tint possibly three times as distant as I could with the cool white tint. But, I found the cool white will certainly throw raw light farther.
It just depends on the application the user has in mind I 'spose.
I'll try them out side by side again, but the moon is coming ahead well now so the nights will be getting a lot brighter.
This effect has a name, can't remember it off the top of my head. There is an entire thread about the way your eyes perceive light. I think the important thing we should get out of all of this is that Saabluster came on here and said that he was working on a new and improved version of the TN31. Not that some one obviously misspoke, and please if you are shooting anything at 600m or so don't do it anywhere near Chattanooga, TN because I am a crack shot what the military calls an expert, but I don't trust myself at those ranges and unless you are a trained sniper I am not sure that you should either. I think the farthest that I have ever shot accurately was 300m prone with an M16 and iron sights, not something I enjoyed doing, but that was during the day with no wind and 15 people making sure that the firing line was clear.
I taught marksmanship back in the 70's.
You can hit stuff a long way off if you know how to compensate for all the funny things going on between you, and your target. Its just a lot harder at night...your fovea, the narrow part of your vision that you need to see the most detail (You instinctively squint to reduce your field of view TO that narrow cone of vision when trying to resolve detail)...SUCKS in low light.
Sometimes, when its dark enough, and your eyes are night adapted, you can look right AT a target, and not SEE it...but, if you look to the SIDE of the target, you CAN see it...OUTSIDE of the fovea's cone of vision. The fovea has mostly cones...which are terrible in low light compared to rods...but, around it, are plenty of rods. So, if you look to the side of what you want to see (use peripheral vision) you can acquire targets that are otherwise invisible.
You guys afraid of the bogeyman or something? :naughty:
I've hundreds of photos of foxes I've shot at night out to 300 yards.
Different gun & different light I'd probably stretch that out farther. But right now I'm happy where I'm at with what I'm working with.
The TN31 matches the SR90 for throw but with a smaller beam and less light output. A de-domed SR90 gets a little over 200,000lux, impresive but isn't the lowest OSTS TN31 like 245,000?The 75 has less range than the TK70. It is a more focused but still floody beam...but the overall cd is lower.
My TK70 has decent range...but not like my SR90, and definitely not like my Dedomed SR90...and I believe the specs indicate that the TN31 STOCK should be closer to at least the SR90 end of things....surpassing the TK70.
The TK75 has a lower cd than the TK70, so it will be even further behind in range, and so forth.
I know this is an old thread, but I was in the process of modifying my TN31 again, and I found something disturbing that tells me quite a bit about why these lights need to be modified by mike. I was removing my old de-domed XM-L U2 bin and upgrading to a new XM-L2 U2 1C bin led that I then de-domed, when I found that the corrosion inhibiting plastic layer on the back of the copper was never removed and was acting as a heat barrier. I had noticed that my TN-31 took a remarkably long time to heat up and did lose a substantial amount of light over time. The light now gets warm in a very short period of time and throw substantially further. I was able to get a visible amount of light at 1700m on a clear night, I don't know if this means that the 15% more light output is even greater than 15% gain in throw or that I got a top end U2 bin led this time and a low end U2 bin led previously, or if the added thermal properties added a significant amount of light output.