ACEBEAM K75 LED Searchlight Throw 2500meters 6300lumens Output Released

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twisted raven
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If I had to guess, dedomed XHP70.2 MF04S would do around 5000-5500 lumens and 900kcd. It should definitely manage a turbo output a little longer than the K75 at its turbo. Stock MF04S with dome on was quoted at 6000 lumens and 600kcd.

If ran direct drive, a dedomed XHP70.2 in the MF04S would do like 8500 lumens and 1.3mcd, and probably get as hot equally as fast as the K75.

I definitely don’t like the idea of a loud, active cooling light. What Acebeam could have done was introduce an output of around 4500-5000 lumens that wouldn’t get hot nearly as quick. The efficiency of the SBT90gen2 is going down the toilet when driven to 6300 lumens. . And as I wrote previously in the topic, I definitely would have moved the cooling fins that are halfway up the head further down to be more usable. When more conservatively driven, it seems pretty great (2500 lumen level has no heat problems and runs with ruler flat regulation for a little over 2 hours.)

Texas_Ace
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Anyone know where to get the SBT-90 Gen 2?

I want to play around with them to see if it is possible to use an FET driver with them. I have a feeling they will not be driven hard enough this way but only way to know is to try it.

roma58
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Lou Minescence wrote:
Can you lock out the K75 by loosening the tail cap or body a half turn ?

Yes you succeed.
vortex619
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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.

K70
https://ibb.co/SwTYCWK

K75
https://ibb.co/gFhdX6Z

twisted raven
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It is overexposed, but it does put out a very vivid and wide beam.

twisted raven
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More pics, open in new window for full size:

Also, I think somebody wanted to see high (2500 lumens) vs turbo (6300 lumens)? I got you covered:


SKV89
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WOW. The K75 is more focused than I thought. I like it! What is the distance?

d_t_a
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discharged wrote:
has anyone ever developed a light with a belt worn battery pack option?

Impressive run times at the needed current……………..

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)

http://www.wisdom.hk/lamp-with-cable/kl12m

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Hardusvd70

twisted raven
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SKV89 wrote:
WOW. The K75 is more focused than I thought. I like it! What is the distance?

~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.

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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.

SKV89
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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.

vortex619
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That’s fair. But when a light outputs at just over 2/3rd of what’s advertised that’s almost fraudulent.

mortuus
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vortex619 wrote:
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..

...where Frugal meets with Flashlight!

twisted raven
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Astrolux seems to make good lights. All I ever hear are good things about MF01/s, FT03, and MF04/s.

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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.

vortex619
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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.

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vortex619 wrote:
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…

I'm ThatCrazyFlashaholic 67

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Here MY initial impressions
https://m.youtube.com/watch?v=X3uUU0a2jjc

I'm ThatCrazyFlashaholic 67

VW-GT-RS
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https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=2ahUK...

Shenzhen write:

“Shenzhen Lantend Electronic Co.,Ltd Thanks. Please contact me on WhatsApp+86 18938845498 or Email wendy@lantend.com for more details. „

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VW-GT-RS wrote:
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=2ahUK...

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.

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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:
https://filehorst.de/d/cuaECxox

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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.

twisted raven
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4300 lumens at 9amps? That sounds pretty great. So it gets 150-160 lumens per watt when driven to 4300 lumens?

SKV89
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4300 lumens at 9A sounds too good to be true. Shocked

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!

twisted raven
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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.

Texas_Ace
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Yeah, just going off the datasheet specs. As we know they don’t always match real world numbers.

I am trying to see if I can get my hands on some of the LED’s to play with.

kat
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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.

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kat wrote:
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.

The one button UI is actually better for emergencies than the old style control ring.

The one button UI allows instant [one handed] access to any one of 3 different output levels.

Ultra Low, L/M/H [memory] and Turbo.

The K70 is a two handed light that is slow and cumbersome, especially in an emergency.

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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.

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