Hello fellow BLFers. I have published a comprehensive review of the Olight Seeker 4 Mini Ti , including photometric measurements before and after modding with Nichia 519a emitters. Please let me know what you think.
The review can be found here: Olight Seeker 4 Mini Ti Review and Mod - Reviews in English - TheLab.gr
Great review! Love the fact you also have a Sekonic C800 
Thank you. It is a recent purchase. Still recovering 
This is what I call a comprehensive review. Awesome work as always ! Thanks.
Thanks for this review.
There’s so little chatter on here about the Seeker 4 Mini. I know there’s not a lot of love for Olight being so commercialized… but they still produce some very decent flashlights.
I wasn’t about to pay $80 for one of these, so I waited for a sale and got it for $50. Overall, I have to say I’m impressed. The build quality is excellent. The anodizing is perfect and the color I chose (green) looks rich and pleasing. Threads are superb, smooth and well lubed. Very good switch.
Yes, for the 18350 class of flashlights, this one doesn’t pump out an above average amount of lumens. I’d say it’s a little below average. Idiot me, I didn’t bother to check the cell charge prior to testing it out. You can’t use a traditional battery tester, because of the proprietary battery. I charged it up and yeah… it’s definitely head-to-head with other 18350 flashlights in my collection. I chose NW, and it’s mostly neutral, almost bordering on cool (to my naked eyes). As for moonlight mode, there’s no visible PWM at all. I even used my phone camera in picture and video modes – no sign of PWM. The UV emitter is reasonably strong. UV sensitive objects pop, including the security strip on currency bills.
I bought this mainly with the intention of just trying it out. I opened it without breaking the seal and could easily put it all back together like new, as if never opened. The only thing I’m not happy about is the proprietary battery. Basically it has both poles on the top end. I’m guessing one could fashion a DIY sleeve to use with non-Olight 18350 cells in order to get them to work in this light. The cells don’t fit perfectly snug. There’s a slightly more than 1mm gap when pushing the cell flush up against one side. Btw, the spring is strong enough that the cell doesn’t rattle.
Olight’s magnetic charging system is excellent. You do get a charger cord included. But a while back I’d bought one of their charging plugs. It has the magnetic contacts on one side, so you plug it into a wall socket with contacts facing up. Light is easily placed atop. There’s also a USB-A socket so you can utilize the charger that way too. Unfortunately though, it looks like Olight discontinued them.
There is definitely a lot of flickering in Moonlight mode, maybe not clearly visible to the eye, as I said in the review, but definitely visible to the phone camera. To see it, your camera has to be faster than the flickering, so go to PRO mode and set the shutter speed at faster than 2.5KHz and you will see it.
Visible PWM is what matters most, for the day-to-day experience. And while the frequency of flashlights having this has diminished a lot, it still comes up periodically. If I can’t see it, and my camera’s default video mode doesn’t see it, I think that’s enough to qualify for a good rating on PWM.
(FWIW, I have a few flashlights with visible PWM, and noted as such in reviews. And my eyes detect it. So, it’s not like I’m PWM insensitive).