yes, google finds this
What tool or technique did you try?
Sometimes pressing the bezel against a silicone soldering mat and then twisting, will unscrew easily.
Could use external snap ring pliers
but yes, they can leave marks…
2 Thanks
New Delivery Day 
LHP531 4000K arrived
Mod #1
Convoy M21E used to have SFT40 3000K
Rough output comparison - ceiling bounce test
| Mode | SFT40 3000K | LHP531 4000K |
|---|---|---|
| 1% | 2 | 2 |
| 10% | 31 | 40 |
| 40% | 84 | 122 |
| 100% | 202 | 352 |
Throw comparison - at 6 meters (UPD: switched to OP reflector and added new measurement)
| LUX | |
|---|---|
| M21E SFT40 3000K | 3900 |
| M21E LHP531 4000K | 2050 |
| M21E LHP531 4000K OP | 1710 |
| BT90 L90?? 6500K | 5800 |
| M21H 8° XHP70.3 4000K | 775 |
Unfortunately this emitter doesn’t work well with smooth reflector
6 Thanks
Tried to press agains a rubber surface and turn the head, but no success…
Thanks for the inputs
1 Thank
Mod #2
Convoy T3
SFT25R 5000K → LHP531 4000K
I tried Kaidomain’s 18x12.4mm SMO reflector with 7mm bottom hole but it produces a ton of rings. So settled on a TIR lens. Not the cleanest beam but it’s OK.
This flashlight is no longer a “thrower” and still it’s the throwiest among all of my 14500 lights (TS10, SP10, EC150, Pokelit AA)
7 Thanks
Last for today
Mod #3
Wurkkos WK15
XHP50.2 6500K → LHP531 4000K
Actually I swapped XHP50.2 with SFT40 5000K long ago and wasn’t satisfied with the beam getting much narrower and less bright. So now I put back a powerfull emitter but with a better CCT and no ugly tintshift this time.
The beam profile is close to the one of Convoy S21E XHP50.3 (4000K)
Turbo output (ceiling bounce test)
| WK15’s output: | Peak | Sustained |
|---|---|---|
| XHP50.2 6500K (looked like 5700-6000) | 229 | 66 |
| LHP531 4000K | 317 | 89 |
| SFT40 5000K | 152 | n/a |
3 Thanks
Rosier than XHP50.3HI, as expected! And more output compared to XHP50.2, despite the lower CCT and better tint. I wonder how much is due to increased efficiency, and how much due to more current pulled by the lower Vf.
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Yes, it’s noticeable with naked eyes too (but with direct comparison only)
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There’s something odd there, SFT40 3000K makes about 1400lm at 8A, those number suggest LHP531 makes about 2400lm at 8A. I can’t wait for koef’s test of this emitter.
I’d say quite a lot since Wurkkos has no regulation.
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Do you mean the figures should’ve been higher?
I feel like ceiling bounce favors narrower beams. Because more photons do not scatter from walls in different directions but travel straight to the ceiling right above the phone and then back to the phone’s camera.
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from first quick test of 6500 K variant I can tell: this could be realistic.
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Ouch, that’s way worse than datasheet suggests. So the improvement people are getting comes from the low Vf in a direct driven flashlight, not the raw power of the emitter.
My sample generally has poor performance. It is even a few percent below the specified bin of 520 lm min. at 1 A.
At 8 A, I get just under 3070 lm. According to the data sheet, it should be about 20% more…
I hope that other samples I will get soon have higher flux binnings.
1 Thank
9 Thanks
This TIR looks really good! Was this flat, beaded, or matte?
Do you notice any artifacts due to the diffusion? I’ve found that Convoy’s hexagonal lattice beading causes a 6-pointed star beam shape.
thanks for the beam pic, looks great!
Did you install the glass over the Tir?
this is a 30° 20mm Tir (does not come with a holder you need to remove from the 21mm Convoy)
pic shows I deleted 4 parts, including glass, when I installed the Tir…
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I left the glass. But sanded down the bottom of the optics a little bit to make it fit. Only needed like 1mm sanded off to make it work.
4 Thanks
thanks for the info… makes sense, the glass is 1mm thick…
2 Thanks
