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.
This thing is fun. I hiked up a mountain last night with a friend to get at least 1/2 mile away from houses in order to play with the K75 and W30 without disturbing people. We probably caught the attention of someone maybe a mile away and he was shooting a laser at us and we shot back. It was like a super distant light war. My friend became an instant convert into the flashlight hobby.
I bought mine from Andrew & Amanda. Tested with Texas Ace Lumen Tube calibrated with Maukka lights and a Sekonic Spectromaster C-800-U. Lumen measurements taken at 2 seconds from turn-on.
Acebeam K75
Power Mode Turbo
4,310 lumens
6809K
-0.0047 DUV
69.9 CRI
-9.9 R9
44.4 R12
63 Rf
97 Rg
Acebeam K75
Power M4
1,538 lumens
5755K
0.0034 DUV
66.9 CRI
Acebeam K75
Power M3
778 lumens
5480K
0.0074 DUV
66.7 CRI
Acebeam K75
Power M2
247 lumens
5098K
0.0131 DUV
66.1 CRI
Acebeam K75
Power M1
128 lumens
4981K
0.0151 DUV
66.3 CRI
Acebeam K75
Eco Max
1,820 lumens
The turbo mode with a -0.0047 DUV looks beautiful pure white. The lower modes with positive DUV has a greenish tint.