LEP Flashlights are INSANELY Bright

Testing an LEP (laser excited phosphor) flashlight. Can it actually throw a beam 1km? Are these things even useful? Teardown, measurement and explanation of how these things work.

The flashlight we tested is the Trustfire T30R, here is the amazon link:

00:00 Introduction
02:02 Background
04:35 Range Testing
08:40 Power Testing
16:35 Teardown
19:47 Summary
22:11 Closeout

[Posh-Arthur]

A rather enlightening video, if I don't mind saying so myself!

[Farben-X]

As a bonus point I would also add that it is the first torch that can be used inside chernobyl reactor 4 even when the battery has run out.
[the YAG works as gamma scintillator also, so will emit light if irradiated]

[bcfr]

I always learn something from your videos. Thank you!

[tonyeagling]

Very informative video, easy to understand and a lot of fun to watch, hopefully you have enough for your new camera soon 🙂

[Ed]

I like how he is just casually pointing that huge-ass beam into someone's window 😂

[DrEko]

I imagine this would be useful in search and rescue. One of these in a survival kit wave it in the air and the rescue team could pinpoint you from miles away.

[M.J.C.W.]

I thought good content like this went extinct on YouTube. Thank you

[OriginalThisAndThat]

I remember when I was teen and wanted a small maglite so badly. It was so cool, and bright.. At the time.. Now watching this, something like 10000x brighter.

[Shaken_AND_Stirred]

I’ve had the Acebeam W30 for a little over five years. Photos and videos make them look more impressive than they actually are though. That’s not to say it’s not an impressive flashlight. It is. They work best if there is fog or mist in the air to have the beam really standout. It’s not a flashlight to go walk your dog with though. It doesn’t create enough “spillage” light to illuminate the way. It just creates a super bright and super hot spot at the end, which ironically, does provide some spillage (at the end of the beam) to illuminate the way.

They work best for trying to illuminate something that is at a great distance a way, such as trying to get vehicle lights to reflect or something like that if you’re actually searching, but how much of that are we really doing….. More than anything, they are an impressive toy to fool around with. You won’t get tired of it.

[Alxasaurus]

LEP is insane! I don't know what people use those pocket search lights for! Maybe for dazzling assailants, giving away your position for SAR, blinding oncoming traffic, etc.

[FunkMunkVRGT]

Lep flashlights are actually less bright because they only produce only 500-700 lumens, while leds produce maybe 1, 000. This lep looks brighter cause of how focused it is and the range is very far.

[billr]

“It isn’t very practical flashlight”. Thank you for that and well done explanation save me hundreds of dollars. I’m a bit of a flashlight collector but this advice saved me good money.

[WaffleStaffel]

Early LEP flashlights (like 3 years ago!) actually had a remote phosphor configuration, before the units with the phosphor blob on the the laser (presumably a VSCCEL?) came out. Now they're uncommon in flashlights, but you still see them a lot in headlights.
I just got myself a $6 LEP flashlight. Impressive, but not terribly practical.

[NewFrontier]

My t30r arrived litrelly today. I definitely recommend any torch/flashlight enthusiast to purchase. They're genuinely stupid bright and illuminate buildings in low light clearly from .5 miles away

[RainOrigami]

well if it just had one of those adjustable lenses that can unfocus the beam, wouldn't it make a great wide angle flashlight?

[juanvilches]

El mejor vídeo de análisis de una linterna que he visto hasta hoy, excelente gracias...

[LozzoAmiga]

When i was a wanton lad that would have been known as a bobby dazzler, as in the kind of thing you shine out the back window of your Mk.2 Ford Escort at the coppers when they try to follow you.

[HobbyHalloween]

I never heard of LEP, while played with UV lasers and noticed this myself... the light from this technology is incredible.

BTW: Congrats on getting to the 4K hours watched and 1K subs so you can monetize... I think you've probably been eligible for some time now but now want to tap into that revenue stream. I understand that, I too need to do that myself to support myself after being laid off of my Firmware Engineering job a year ago and not easily finding new work... so recently I've been putting in more time on my tiny channel with Halloween content, I do plan to do technical things on my channel, after all I am an engineer. Nothing wrong with finding ways to fund your work. I support that idea completely.

[CaoticoFanegasO_o]

It might be something you could use if you want to be found, like an emergency torchlight. You can use it on close reflective elements to get an usable light, but more importantly, no one will skip that beam even from a search and rescue helicopter if you get hurt in the mountains.

[two]

Great channel you have, glad I found it!