Under construction :
Purchased from Emmy Zhang : http://www.aliexpress.com/product-fm/517413014-1PC-TrustFire-TR-J12-Flashlight-5-CREE-XM-L-T6-LED-5-Mode-4500-Lumens-Memory-wholesalers.html (At the bottom you can see 8 purchases, one of them is mine)
The reason why i purchased from here is because (1) They said they will check it before sending out, that's their claim (2) They offer 15 days warranty after signature for receipt of the product via registered shipping. Any issues, they cover your return postage. How cool is that? (3) 1 year warranty, you pay for shipping back, they ship you a repaired product I guess...not sure. <<-- caveat emptor, i think i will be buying the next 10x XB-D light or something already. LOL!
Aliexpress does not use Paypal already, but they use ESCROW. I just received the product, tested it (as below), just paid them by clicking on the Order is Complete button in aliexpress. So payment is released from ESCROW -> Aliexpress store. Else Open Dispute. It's not paypal, they do not even get paid first.
I have 3 pages worth of Aliexpress purchases. The only single problem was due to customs check and holding, and finally return to seller via EMS. Contacted the seller, full refund was made to credit card.
Ceiling bounce, same location
Trustfire J12 with 2 cells - 225 lux (I put the extender at the bottom in this config to make it equal in height to the 3 cells)
Trustfire J12 with 3 cells - 215 lux (don't ask me why, tailcap measurements sometimes are not representative)
Cells are done with XTAR 2600 and TF Flames 2400 at about 4.2V full charge.
For ref :
DRY CW T6 1A in Turbo : 250 lux
DRY NW T4 5A3 in Turbo : 225 lux
DRY NW T6 3C in Turbo : 255
DRY WW T3/T4 7B in Turbo : initial 175 lux (I took out the power resistor inside, Chicago X may want to open his and check for it)
Fenix TK70 - 220 lux
Xtar S1 - 210 lux
Trustfire TR-3T6 - 130 lux
Uniquefire 3900 - 143 lux
Sky Ray SR3800 - 160 lux
Sky Ray SR3800 in DD/DRY drivered - 260 lux
Sky Ray SR3800 / DRY in maxed out Turbo with fully charged good cells + UCL and ice cooled, initial 305 lux.
Sky Ray SR3800 + DRY ice + SLA and constantly being charged, too high to post. I blew the light though, knocked it hard and it came back. Too scared to try again.
SWM T40CS - 79 lux
SWM V60C - 79 lux also
Light output sag : (3-cells) No wind, enclosed area 28 deg C ambient
1st minite - 213 lux
5th minute - 205 lux
12th minute - 199 lux (49 deg C at the head) 6.6% sag at 12th minute. That's very good, the ubiquitous Trustfire TR-3T6 which Benckie so loves is about 5% at 10th minute and that's a massive drop-in with lots of threads plus it's a 130 lux output device while this is a 220 lux device. :) (figures are my ceiling bounce, they are relative)
STOPPED, it's getting hot. I think 10 min runs are very safe....since 99.95% of the folks here enjoy cooler temps than me, except perhaps Poh in BKK. heh...
PWM frequency - 124Hz in low
Intensity : 24.6k cd (same as mitro!)
---------------------------------------------------------------------------------------------------------------------------------
Ok new measurement. This cell regulates by boosting to a certain point and then goes into direct drive, so it shifts into a lower output. After that even in low mode it manages to trip the cell's protection circuit. I got about 4.6V at the tail (2.3V per cell) before it cuts.
So this light easily digs the cells to below 2.5V. Just another of the lights in which it really uses everything in the cell. (most of my lights have low voltage cut offs way below 2.8V per cell). So yet another example in which testing cell discharges to below 3.0V is needed.
Confirmed - it can still run on 1 x 18650 @ 3.9V, there is light.
-----------------------------------------------------------------------------------------------------------------------------------
King Kong 26650s will work. The only issue is that the KK 26650 positive end is recessed beneath the wrapper. So any 2 or 3 cell lights would not work.
I used 2 magnet discs for the +ve end, works great. However this is a dangerous solution as the magnet may shift after a knock and this is an unprotected cell. It would be very naive for anyone to rely on the internal anodising as insulation.
A solder blob as +ve nipple works great. It may get dislodged in a hard knock, but it is not "long enough" to touch both the positive cell button and negative tube. Just re-solder.