Dave’s Tech Reviews

Mostly just flashlights

Latest posts

Astrolux WP2 LEP 2.3km throw flashlight review and beamshots

The Astrolux WP2 is a LEP flashlight that throws 2.3km or 1.3 miles. The only light I have that throws further than this is the massive Astrolux MF04, so I was interested to see how the much smaller WP2 would perform.

Lumintop Thor II LEP Flashlight Review

Pocketable and affordable 1800m throw LEP flashlight. My first LEP flashlight! What’s that you might be wondering? LEP stands for Laser Excited Phosphor, sometimes known as a White Laser.

Convoy flashlight naming guide

Convoy have a whole load of flashlights, all with confusingly similar names. Convoy sell their flashlights on the Convoy AliExpress Store, Banggood and Nealsgadgets but there’s so many that it’s impossible to work out which one is which. Here’s a rough overview of the main ones. This isn’t going to be fully comprehensive but should …

Flashlight parts

From top to bottom, a flashlight is normally made of these parts: 1. Bezel2. Lens3. Reflector (or TIR)4. LED5. MCPCB (board the LED is soldered to)6. Metal heat sink (shelf or pill)7. Driver (makes the LED get the right current and voltage)8. Cell9. Tail cap 1-7 are contained within the head. Number 6 is where …

Wurkkos TS30 flashlight review

Introduction Wurkkos are still new in the flashlight world but are starting to get fairly well known due to getting lots of things just right. Members of r/flashlight regularly recommend the Wurkkos FC11 due to its tint, build quality and USB-C charging. From what I understand they’re a separate company to Sofirn but the 2 …

Imalent RT90 flashlight review

1308m throw, 4800 lumens Introduction Imalent are known for their high power and long range flashlights, squeezing in as many lumens and candela as they can. The Imalent RT90 is one of these, designed primarily for high throw, rather than lumens. That said, it still produces almost 5000lm. Imalent released their RT90 flashlight at the …

Convoy M3-C flashlight review

This review was originally written for and appeared on 1lumen. This flashlight was sent to me for review at no cost by Convoy. I have not been paid to review, nor have I been holding back on problems or defects. Introduction Convoy is well known amongst flashlight enthusiasts. Especially for their low cost and easy …

Sofirn SC31 Pro flashlight review

Sofirn have released an upgraded version of the SC31B, called the SC31 Pro. The light now has USB-C, Anduril and a better LED.

Sofirn C8F tactical flashlight review

The C8F is a high power tactical light from Sofirn. It has 2 switches for easy operation and throws a reasonable distance.

Playskool flashlight 4000 lumen upgrade

This week I took an original 1980s Playskool plastic flashlight, removed the insides and replaced them with a 4000 lumen flashlight.

Sofirn IF25A

Sofirn IF25A review

Another light from Sofirn I’m reviewing is the IF25A. This is a pocketable flashlight with 4 LEDs. About the light The IF25A is small but powerful budget light. It takes a 21700 cell and has 4 SST20 LEDs, pumping out up to 3800 lumens. It has an E-switch and uses the Anduril flashlight user interface. …

Anduril Thermal Calibration Config

Flashlights with the Anduril UI step down the brightness when they get to hot. They do this with a temperature sensor, which may need configuring when you first get it.

Imalent MS03 flashlight review: The brightest pocket flashlight in the world?

This is quite exciting. I got my hands on Imalent’s new MS03 flashlight: this light pumps out 13,000 lumens from a single cell, making it the brightest pocket-sized flashlight in existence. Read on to see what it’s like in real life. Purchasing You can buy the light from ImalentStore.com. It’s currently $129.95. Quick review This …

Flashlight User Interfaces

A user interface is the way that someone interacts with a device. In the case of flashlights, it’s normally by 1 or more switches that are pressed. A UI can be the different between a flashlight staying on a shelf or being used regularly.

Sofirn SP40 headlamp review

The Sofrin SP40 is a great entry level headlamp that has the quality of lights twice its price. It’s a great all rounder, coming with USB charging, an included cell, head strap and even an extra body tube for shorter cells.

Sofirn SC31b flashlight review

Sofirn have produced a great budget light in the SC31b. The simple user interface, USB charging, included cell and pocket clip make this a great flashlight for all and easy to recommend to others.

Manker MC12 flashlight review

The Manker MC12 is a pocket thrower flashlight that reaches 650m. This is a great light if you want to light things up a long way away but also want something that’s not so heavy that it always gets left at home.

Why Flashlights?

You may have noticed that this blog seems to focus on flashlights (or “torches” in the UK). They’re simple things compared to most technology but their elemental nature makes them almost entrancing.

In search of the best pocket thrower flashlight

I started looking for the best pocketable flashlight that throws its beam a long way. This article documents the rabbit hole I ended up in. In it I’ve compared lights from EagTac, Lumintop, Acebeam and Emisar.

Converting Candela to Throw

Multiply the candela by 4, then square root it to get the throw in meters.

Or square the throw in meters then divide by 4 to get the candela.

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Latest comments

  1. Hey I’m glad you gave it a second thought, kudos! The article for sure is very helpful to beginners.

  2. You’re right, “divided by 0.25” is more correct. I was aiming to give an easy to remember and calculate formula,…

  3. Your use of “times 4” and “divided by 4” bothers me. Throw (in m) is calculated from intensity (in cd)…

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