Acebeam seems to advertise below the specs unlike all other flashlight brands. My K70 was measured at 470k cd as opposed to 422k that they posted. Have to respect that.
Astrolux on the other hand… Their MF02 is posted as 3k lumens/ 1.5km throw which is nowhere close to reality. Jokable brand.
Not all Acebeam advertise below spec. I remember there was at least one or two (don’t remember which model) that was advertised a bit above specs. While some others like the Acebeam H15 was advertised below spec and the TK16 Oslon is spot on per my own testing. Olight seems generally spot on and sometimes below spec also.
I think the problem with Astrolux and the less premium manufacturers is that they don’t have equipment to measure lumens so they just guestimate using the emitter spec sheet with the assumed amps. I remember reading Hakelite has to send their lights out for third party testing so they don’t bother to test all their lights. Sofirn also don’t seem to have testing equipment. Their C8F 18650 was spec’ed 400 lumens less than what I tested but the C8F 21700 was spec couple hundred lumens higher than what I tested.
The lights themselves are generally pretty good for the price. The ratings are just usually inflated. If you buy it knowing that then no real issue with most of them that I have tried.
Does anyone know a good retailer to buy one of these suckers if you reside in Canada? Flashlightworld is usually my go-to, but I’m growing impatient with them at the moment cause they don’t know when K75 will be available.
Interesting, I can’t not figure out how to download the datasheet but based on those numbers, they must be overdriving the LED pretty heavily to reach 6300lm in the K75.
Anyone know what the actual drive current is in the K75?
The price is better then expected.
Edit, got the datasheet downloaded.
Looks like the 4300 lumens is at 9A, at 18k it is rated for 5800 lumens.
Also looks like it can be overdriven and still gain lumens if cooled, so 6300 sounds reasonable. I would still be very interested to know what the K75 is driving it with.
The forward voltage has a really wide range of 2.8-3.8v in the datasheet, making it hard to figure out if it would work with an FET driver.
If that’s the case, TA might just be able to get the GT4 to run 4 of these and earn the title of the farthest throwing production light yet with monster output!
4600 lumens at 18 amps sounds more realistic according to how hot the K75 heats up on turbo— feels like it’s pushing more than 100 watts to heat up so fast.
I don’t like the interface.
On the K70 you had that nice ring, but on this one there’s just a stupid button. Not good for emergency at all. You need to be able to turn it on in the mode you want.
Just received my K75 yesterday from Andrew & Amanda. Haven’t really had time to play with it but just did a quick lumen measurement with the TA lumen tube calibrated with Maukka lights at turn-on.
4,310 lumens at turbo in power mode
1,820 lumens in Eco max.
I did not take any measusrements at 30s. Lumens fall after turn-on so 30s should be much lower. I tried both the stock Acebeam 18650 protected cells and Keeppower VTC6 3100mah protected cell and got the same results. They both use the Sony VTC6 underneath. For anyone getting higher measurements, what cells did you use? I wonder if I got a lemon or is Acebeam ratings severely inflated on this light. They are not as good as Olight, Fireflies, and Emisar when it comes to lumen rating accuracy but nothing this bad. I measured the Acebeam TK16 osram version and got 1100 lumens, which is not too bad.
The K75 is smaller and much lighter than I expected. The head is slightly smaller than the R90C. I can fit it completely in my 4” TA lumen tube for an accurate measurement. I think it is very well designed. I found a pic that it is compatible with the X65 8-cell rechargeable tube for extended run times. I also tried an X80 4-cell tube and it fits in the K75. However, the K75 tube does not fit in the X80. Weird.