WOW. The K75 is more focused than I thought. I like it! What is the distance?
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.
That’s fair. But when a light outputs at just over 2/3rd of what’s advertised that’s almost fraudulent.
well but u shouldnt go to hard over a budget brand vs a more expensive one like acebeam… kinda unfair to compare like that…
Astrolux seems to make good lights. All I ever hear are good things about MF01/s, FT03, and MF04/s.
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.
Try Neal at Neals Gadgets…
Here MY initial impressions
Shenzhen write:
“Shenzhen Lantend Electronic Co.,Ltd Thanks. Please contact me on WhatsApp+86 18938845498 or Email wendy@lantend.com for more details. „
Thanks for the heads up, I will send an email and see what comes of it.
wendy wrote to me:
LUMINUS SBT-90-W Gen2 main electrical power parameters as below:
35$ / piece.
a. Typical voltage is 3V,
b. Max. Current is 18A,
c. Max. power is 60W,
d. Max. Flux is 4650lm based on the current 18A.
Datasheet:
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.
4300 lumens at 9amps? That sounds pretty great. So it gets 150-160 lumens per watt when driven to 4300 lumens?
4300 lumens at 9A sounds too good to be true. 
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.