Someone finally posted beam shots of a K75 on YouTube. It’s also the same guy who posted beam shots of K70 a few years ago. I’m not sure if it was more foggy that day, but the difference is astounding. My K70 got completely destroyed. Now I have to buy this light for pretty damn sure.
Off-topic for the current thread… but this corded cap lamp can conceivably have the battery pack worn on a belt (battery pack cord length is at 1.4 meters)
~200m to river bank. At this medium range, I expected the TN40vn to shine… and it does, but the K75 is surprisingly close to the flood performance of the TN40vn at this range. The ROT66 nicely floods the foreground, but doesn’t quite light up 200m. Something like the MF01S is probably ideal in a scene like this.
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.