Nice mod Willy
any artifact rings around the hot spot?
Nice bump! Maybe elevating it a bit will get better results, but still a cheap bump.
Thanks. Itās not ringy at all after I painted everything black. There is one very faint large outer ring, but Iām not sure it itās possible to eliminate it. I did notice the led seems more defined on a wall shot with the collar. I can even see the outline of the square pad.
I will try moving the collar up a bit and taking more readings. This light is reading very low for some reason. Maybe because it has sat for so long. I think Iāll try sanding the solder blobs on the ends of the springs first.
Cleaning the lens and all electrical contact points could really make a difference. Once you have it all tuned-up Iād love to see you repeat your w w/o collar readings. What cell and driver are you using?
I got a SBT90.2 in a 1504 pill - it does 500+ kcd. Would be interesting to try a DIY collar on it...
Niteye Eye10 Rotary
219b 3000k 9050 D200 (trailhunter LED),
Upgraded mcpcb, reflector and centering ring (moderator007 finds),
Driver has Strobe at double twist,
Sapphire lens (Archibald Tuttle tip)
Remove detente ball and spring, relube with Nyogel 767a high damping grease, and install glow marker (tx pinkpanda) on tail.
Whats not to Love? 
Whatās up with this reflector showing 4 bright spots?
It seems that quad effect is related to having the camera closer to the LED than the focal distance of the reflector.
Notice that reflector in the Eye10 is not all lit up, because I am holding my iPhone really close, hoping to show that the LED centering, turned out Really Well!
I checked and the same short focal distance quad effect happens with other lightsā¦ once I pull back to fill the reflector with the light of the LED, the effect disappears
this is a reflector from a Maratac CR123
up close:
farther away:
this is a reflector from a V10a
up close:
pulled back:
Yeah, but I would expect it to show more or less a ring. I guess large die size (and therefore more pronounced squareness) relative to ref size plays a role hereā¦
BLF GT White Flat 1 WHY! PITA 
(Got bored, waiting on parts for a 90.2 build)
2S2P to 4P Carrier modā¦ simplicity at its finestā¦
Mtn. SRK/M6 Linear Driverā¦ 5.2amps Big Springā¦.Simple 3 modeā¦
Hmmm so far so goodā¦ 725lmā¦.680lms until batteries are DEAD!
Let the games BEGIN! 
Nice work KB!
Any throw numbers?
Iām curious to know numbers too. Great mod btw Kawiboy
here is an example of the beam from the stock reflector, that I removed
and an example of the beam from the upgraded reflector, that you noticed has the quad effect
this reflector has a smaller hole at the bottom, both LED are 219b
He just wanna make us beg... K, i'm begging... 
Just over 1.3Mcd so far. Looks like more to be had. Got 13500 LUX at 32.4ft. Prolly need to measure further out, but itās raining now, maybe after or later tonight?
. I came up with a new or better way to shim the reflector upā¦ and keep from spinning the shims and the big spacer bar, to keep from sheering the leads offā¦ got real lucky didnāt fry the driver
. Also just a couple thousands off center JACKS the spot up, with this tiny emitter to this big ass reflector it is a BIG DEAL. I maybe have .009ā slop in the mcpcb diameter to the centering block I.D. Got a couple Ideaās on how to tighten it up, so I donāt keep losing itā¦after bumping it around during shim changesā¦
Donāt let the pic fool yaā¦ that spot is just a Micro Dotā¦ unbelievably smallā¦
Hahaā¦shit, you can see how small the beam is narrowing down at that range 
ā¦ā¦ 
Kind of sad, Iām just doing this for something to doā¦ it will all come down and go away, once I get my partsā¦ Itās been funā¦
That tree looks like a big candle 
Nice work
Might be a first for KawiBoy1428ās local fire department. āI was just shinning my flashlight up in that there tree and it caught fireā.
I grabbed a Convoy M21C with the intention of finding something interesting to slap in the host. I only played with it for a few minutes before tearing into it. The SST40 is a good performer but I donāt really care for the tint.
I have been wanting to try a Luxeon V 4000K so this was a good opportunity. I figured with the relatively large die and medium size reflector it would make a reasonably throwy beam; great for my nighttime trail walks. The M21C has very thick walls on the head and it takes a long time for it to heat up. Perfect for sustaining high currents for a long time.
I used one of the nifty remote MOSFET drivers from led4power. I donāt know if it really makes much of a difference as far as thermal performance but itās something different at it looks neat so I figured Iād give it a try. I set the driver to CC mode with a max of 7A.
The M21C is designed for a 22mm driver but the LD-B4 is only 20mm. This means I had to solder the driver to the retaining ring. This isnāt really a problem, but I wanted to solder the wires onto the MCPCB first because the head is very deep and I didnāt want to be fiddling with all those tiny wires down inside there. After soldering the wires to the driver, I gave it four or five anti-clockwise rotations before screwing the driver/retaining ring into position. I was worried Iād twist off some of the tiny signal wires but it ended up working out just fine. There was plenty of space in the cavity for all the extra length of the wires.
I really like the Luxeon V. The tint is very neutral; not pink but doesnāt appear green either. Itās very uniform with minimal tint shift across the beam. Itās not high CRI but colors appear natural. The hotspot ends up being just a hair tighter than a C8+ with XM-L2.
Sunwayman V10a
mod to 219b 3000k 9080, Sapphire lens, relubed control ring with Nyogel 767a, attached some tiny trits to the body.
Makes about 90 lumens on AA Eneloop, about 180 lumens on LiIon. The minimum mode is an Ultra Low Firefly of 0.005 lumens. 
Great mod jon_slider 
Those little trits looke nice too