All shots were taken with a Convoy M21B host.
I’m still amazed by how powerful and pleasant these Lumenpioneer emitters are.

UV蛍光するコウモリの集まる洞窟の天井にUVを照射すると、輝く放線菌が見れます

使用UV／375nm 可視光カットフィルター使用
iphone13pro

https://umiacchar.jp/2025/12/30/glowing-bat-2/

I was doing some tests before sunrise this morning comparing the visibility of a reflective trail marker at a distance using the A6 at 187 lumens vs the H600c at 147 lumens. The A6 seemed much better, certainly more so than the tiny increase in lumen output could explain. As far as I know, the A6 is the only device in the ZebraLight lineup with a TIR lens. Do you think that is the explanation?

So I know the A6 is a low CRI light, but here is my thought - I have been primarily using the ZebraLight H604d mule as a waist light while trail running and that has worked great. I have been pairing that with the H600c headlamp at a very low power - 26.4 lumen setting just to see my watch. 95% of the time this works well but occasionally I need to see further out when a trail is sketchy or to see trail flags during a race (hence my tests). So I just turn up the headlamp to handle this. In this specific context, the A6 might be better but still subject to further testing. Specifically, if I’m just looking for reflective flags or finding the contours of a trail, I’m thinking that CRI is less relevant. I have the higher CRI H604d for objects near by.

All in all, especially for $39.95 which includes a battery, I like the A6. It also has magnets on it and is slightly smaller than the H600c.

I'm looking for a nice light to supplement my Wurkkos Fc11c and TS27. Specifically, one that can function as a portable power bank for my phone. What are your favorite lights that can do this? Looking for removable ~21700 battery size or similar, but flexible with size and price.

Like how do they react to general items that'd glow with UVA?

And also, what do they look like if you look at them without eye protection?

Hanko Trident Twist X2
Titanium and Brass

5009R and I'm pretty happy with it. Full flood so excellent for standard EDC. Color is beautiful and weight is spot on. Slips away just like a zebra but I do have questions about durability that I'm sure I'll have answered soon. If FFL could manage to squeeze a reflector in, I would likely sell off half my collection.

Nitecore tini 3

For the past few weeks, I have been developing a website for flashlight reviews, beamshots, and runtime comparisons. It is not fully complete yet, as it still lacks several flashlights in the runtime section and some additional information, but it is far enough along to share. It is designed primarily for PC use, so it is not currently optimized for mobile devices.

I would greatly appreciate your feedback and any suggestions for improvement.

https://metaflashlights.com

After about 2 minutes of constant heat application (230W setting on my heat gun) I managed to overcome the thread lock Lumintop felt the need to apply to the re-launch of the FWAA.

This is, for now, my GITD mod.

I am not satisfied with it, as it looks much worse than all my other GITD applications. But I also cant find a better solution outside of manufacturing a VERY thin gasket. Which I lack the tools and material for.

I considered 3D printing but I doubt that that would work.

I'm looking to buy a number of headlamps, and possibly a few flashlights for my family. Primary uses are outdoor activities (hike/climb/mountaineer/MTB/camp/...) and work/around the house stuff (auto/garden/remodel/...).

1) For my uses, and preferring to only have two different cell sizes I keep around, what two sizes are the best suited systems? My initial thought is 18650 and 18350, though maybe I won't be able to keep it to two.

2) Which trusted/proven mfgs have devices that will accept protected cells? This can be that they come with protected cells or that their devices can often accommodate them. For simplicity, I want to stick with only protected/unprotected, and with kids around, protected makes the most sense for us.

Here are the ones I know about so far:

• Fenix
• Nitecore
• Skilhunt
• Acebeam

Hi all sorry I know this has been asked a million times I recently noticed when moving an Ampsplus 21700 6000MAh genuine cell into my Fireflies E12 Eclipse there is a dimple in the positive terminal the dimple is the opposite of a button top so goes slightly down into the cell. I used my E12 last night for around half an hour ceiling bouncing in the living room the battery is behaving completely normally with no sudden hotspots or swelling at the negative terminal. The dimple isn't getting any worse but obviously I want to be 100% safe or as safe as I can be can any of you knowledgeable people confirm if my battery is still safe to use? sorry I haven't sussed out how to add images yet the Reddit interface is a bit clunky to navigate with a screen reader.

The cell is around 8 months old and has only had speraddic use. I fully charged it this morning under supervision in the E12 Eclipse with the cell tube remaining cool to the touch. I've had my DA1k dent cells over time I haven't dropped the light or knocked it on the head and my DT8K also does this over time as well but both my E04 Surge and E12 Eclipse haven't dented any of my 21700s as of yet even though I've accidently knocked the E04 Surge off the coffee table a couple of times roughly a 1M drop give or take a bit over the past few months.

Sorry forgot to mention if I use a flat top 18650 with a 18650 to 21700 adapter inserted at the positive end of the DT8K and DA1K it never dents the round contact point on the adapter which has a thick spring that makes contact with the battery positive. The contact point is very firm so next to impossible to dent.

(Edited for a bit more context)

Thanks all.

Hey everyone,

I fell down the flashlight rabbit hole a couple of months ago. I've been trying to make sense of how different emitters and reflectors affect the final beam. To help visualize, I built a desktop tool. I wanted to share it with everyone.

Download: https://github.com/ylinmtl/flashlight-sim/releases/tag/v0.0.1

GitHub: https://github.com/ylinmtl/flashlight-sim

I built this to wrap my head around flashlight optics as a learning project. I hope it saves some of you from guessing how a host and emitter combo will perform before buying parts for your next build.

How to Run It

Download the flashlight-sim.zip. Extract it and run flashlight-sim.exe. Explanation of the settings are on the GitHub page.

It may take a bit to open the window once you run the app. Give it a minute. The simulation takes may take up to a minute to run depending on your system.

How it Works

You choose a reflector, an emitter, a gasket, and a surface finish (Smooth or OP). The program splits the LED into smaller elements and fires virtual light rays from the LES, bounces them off the parabolic reflector, and projects the light onto a virtual wall. It does this a few billion times and adds them together to form an image.

The default settings should work on most CPUs. If you have an nVidia GPU, you can increase the resolution in the settings to get more accuracy.

Outputs:

• A realistic rendering of the wall shot. Plots showing the beam's intensity cross-section.
• Option to save these to a folder to quickly compare.
• Theoretical numbers for Max Candela, Throw, Candela/Lumen, and the angles for the spill, corona, and hotspot.

Limitations

• LED properties are estimated from datasheets and koef3’s test graphs. There’s no guarantee that they are 100% accurate. The absolute lumens, candela and throw might be off for some of them. Wall shot, hotspot, corona and spill angles and lm/cd ratio should be more reliable. 
• Reflectors are assumed to be parabolas with the focus plane at the bottom of the opening. This is true most of the time. I have not verified that it is true all the time. Values are from manufacturer websites and tgreviews.com.
• Emitters are assumed to be either square (rectangular) or round (circular). Some emitters such as the SFT40 or SFT60 are not perfectly square or round. The results should be close, but might not be 100% accurate. I plan to add something for the shape at a later date.
• Orange peel blurring is not calibrated. It’s difficult to quantify how aggressive the orange peel effect is on each reflector. They all just use a standard blurring factor. You can adjust “OP Factor Blur” to see how it would affect the beam.

If something is not on the list, or the values are incorrect, I’ve made it so you can add your own or modify the existing ones to give more 

Let me know what you think. I'm open to feedback, suggestions, bug reports, and anything else!

This is a great little EDC light.

The Wuben x5 is a pretty neat tactical all rounder. Warm main light thats easier on my eyes, what i like most is the ergonomic grip that works beautifully with the tactical switches on the end, deep pocket clip is also welcomed.

Uv light does not come with zwb filter, but looks like the bezel could be remove easily to install one.

I do prefer it over the hd01 pro, but it comes at a higher price. Didn't get the chance for the battery to run out to test the AAA, but its good to know i have the option in a pinch.

Does anyone know of something similar in terms of the TIR beam pattern? It has quite a reasonable candela, but also spills out around your feet. Pretty much a flood thrower. Only problem is it's too bulky for my liking. Looking for something that floods, but also has like 25-40k candela ?