The UT-02 is pretty compact, nice light to be sure. Really needs a bit of current boost but thats not difficult, the hard part is not overdoing it! lol
They are welcome to do that, of course. I have my own that I am quite fond of but it wonāt replace such a light as the TC20, pretty sure.
Difficult to get a light any smaller than the DQG, to be sure, so it holds a standard of itās very own that will probably not be equaled by anyone, much less bested.
My O rings are damaged both.I know there are 2 replacements .The only thing I did was apply CRC 2-26 to threads and changed the battery.What size O rings does TC20 use? What causes the Orings to get damaged on a new flashlight ?
In my experience, the only time that I have damaged an O ring was by taking a light apart while the light was very cold. This tore the O ring. I make sure to warm my lights up before I take them apart now
I just cleaned the springs and battery terminals with 70% rubbing alcohol and on the same fully charged batteries, the startup brightness increased from 487 lux to 498 lux. Itās not alot but shows you how grease or other contaminants can be one of the factors for lumen variation between same batch of the same lights.
I occasionally go over the contacts on my lights (lightly) with a piece of a fine Scotch Brite pad to remove the oxidation, restoring the contact surfaces to a bright color. Then I use the alcohol (91%)
I think that oxidation itself creates more resistance than the grease or oil that just the alcohol removes.
Yes but itās actually not really a huge difference. Half the lumens doesnāt mean youāll see half the output, just like 4000lm is not twice as bright as 2000lm. That is VERY evident using the TC20ā¦
When going from high (1800lm) to Turbo (3800lm) theres a noticeable difference, but no where near twice as bright, and about the same difference you would see between it and the V6 Catapult.
Thereās been some posts on the subject before, the āperception of luminanceā
āit takes 4 times the lumens to see a doubling in brightnessā
āa perceived 50% lower perceived brightness is more towards 18% of actual luminanceā
.
The emitters used in todayās dedicated throwers (XP-L HI, XHP35 HI) do not produce the higher lumen output of XHP50-XHP70, but the XHP50-XHP70 cannot throw as far due to their floodier beam with larger hot spot.
Instead of carrying two separate lights as Rambo007 described, several manufactures have designed models that combine the two beams into a single light, Niwalker may have been first several years ago with their NOVA MM18.
The MM18 has seen upgrades to the MM18II and now the MiniMax MM18III, plus a little brother added, the MiniMax MM18JR
A good example of what beam0 is saying , from some of the beamshots I have already , would be the Maxtoch 2X compared to the TC20.
The 2X is making about 1460 lumens compared to the TC20 at about 3800 lumens , but the 2X will put much more light downrange than the TC20 is capable of by far. I am not saying the TC20 donāt blow the 2X away at close range , but after 175 to 200 yards then the dedicated thrower (s) leave the TC20 in the dust as far as range using much less lumens due to the focus.
The TC20 will not even come close to putting enough light on target to see 800 yards or probably even 400 yards for that matter really , as it is a much more floody beam and āwall of lightā closer up.
They are just 2 totally different types of lights and light beams.
Here is an example of what I am describing with a shot from the factory Maxtoch 2X with dedomed XM-L2 U4 1A emitter at 807 yards from a barn and then that same shot enlarged and then the 2X and TC20 both at 100 yards so you can see the much more concentrated beam from the thrower compared to the TC20.