They already have the beam intensity in their specs: 75kcd (75000cd), which means "75000 lux @1m calculated", however kcd is the proper unit for that. (see here).
Really measuring @ 1m is a bad thing to do and calculating throw from that gives quite inaccurate results.
75kcd give 550m of NEMA throw, which is a somewhat optimistic value, half of that might be a more realistic/practical throw value - but that depends on the target you shine your light on.
Redid the output measurement (w/new vid) and runtime graph. I feel the new one more accurately reflects the output and am pretty comfortable w/the numbers achieved. I'm really happy with this setup as it allows me to convey what is the real expected output after any step down's etc.
EDIT: I hear you guys about the lux measurements. Will retake at multiple distances and post when ready.
Fantastic pictures as usual. And what a monster. I am starting to dig the short fat lights. A real shame I cannot DL the vid on this sloow connection.
But I am surprised that the Kcd value is not even higher. When did you measure? Was it the highest measurement just at start up or is the value of 87,2 Kcd a average value? Is it after initial step down or after max temperature is reached?
Sorry about all the Q's but I am very curious about this one :-)
@Ledsmoke, it was after 30 seconds but before the step down. Done on freshly charged battery and no warm up beyond waiting the 30 seconds. I'll be retaking at different distances and will post results when ready.
Been a long time since i have purchased any light, and this is good. Nice and i was going to email my regular shops till i saw the price. Unfortunately at 220 bucks it's crazy. My TK70 with batteries included still is under this and kcd is a wee bit higher. (of course that's a bigger light)
But it's good, time for Trustfire/SkyRay/Ultrafire to come out with 85mm head diameter based lights. The last time that one from cnquality goods was underdriven at 2A. They already have the host ready (and it's quite nice), the X7. :)
Yeah and my Trustfire T8 is ~ 85Kcd after I played more with the positioning of the led. And settles into a comfortable ~ 75Kcd after some minutes continous running. But this is definately good news none the less. I am 100% sure that the quality of the two lights are lightyears apart although I was amazed at what 63 usd will get you these days. And a 10 usd emitter swap :-)
WHOA,throw junkies rejoice!!!! that outdoor shot makes it look like a "frickin laser beam" love it! This is a must have I'm goin to count up the swear jar right now,should be enough in there lol!
Outdoor shots of video comparo of TN31 vs. a few other lights are now up in OP (don't forget to flip to 720P if you're going to compare beams). Sorry that it's poorly done (blurry on some lights), I'm still learning how to make vids but lessons learned from this shoot has given me ideas for improvement on the next one.
Here are the lights (DBS V2 is off to the right somewhere):
Timeline in the vid (I have included titles as well)
ThruNite TN31 - 1:32
XTAR S1 (prod) - 2:09
Sunwayman T40CS - 3:08
ThruNite TN30 - 4:02
Niteye EYE30 / EYE25 - 5:11 / 5:55
ThruNite TN 11 (2 x 18650) - 6:43
NITECORE TM11 - 7:19
Sunwayman V60C - 8:07
SureFire M3LT (MC-E) - 8:48
Klarus XT20 - 9:38
Lighten7 Max L2A - 10:25
Dereelight DBS V2 (w/UF XM-L) - 11:07
Distance to the fence I was shining at is 246ft (75m) and to the bleachers approx. +10-15 ft.