[Review]Lumintop FW21 Pro - 10000lm destruction

When ramping I noticed that there are two blinks. One at about 300lm and the second at the top of the ramp. I’m guessing the first one is 1x 7135 and the second is 8x 7135. Is this correct?

It is safe :slight_smile:

And second blink is 8x7135, the first one… probably 1x7135

Hi, I have tested it with a fan for cooling the flaslight as if it was on a bike, and here is the graph.

! !:FW21-pro-ceil133-40-T-cooled-350410487911055 hosted at ImgBB — ImgBB

Hi, I updated my review. I know, it’s been a long time… (changes mentioned below)

I’ve done my own measurements and it is nowhere near your 2200lm on max ramping brightness. :frowning:

In fact, my results are:

1417lm high mode (max ramping)
7596lm turbo mode, but only @1s, and brightness decreased quickly, so at 10s it is about 6800lm. Really hard to tell, because at 9s it could be 7100lm and at 11s 6700lm.
With 4.1V battery turbo gives only 7200lm, so my 7596lm was with 4.2V battery on a first try. And I used Samsung 30T cell.

EDIT: I saw ZeroAir review, he got ~ 9500lm at 30s which is ridiculous. He probably used higher drain cell to get this result, but I won’t believe it was measured at 30s. No way.

I measured mine at near 1500lm max ramp (and fully sustainable after calibrating temperature)
and 10600lm in turbo at 1s

Using a Molicell P42A cell

Vinh got 7% more output by decreasing the resistance in the circuit. I’m assuming that means just a spring bypass…probably. I would love to try it but I’m not really good with soldering and don’t want to permanently ruin the light.

Does anyone know how many amps this light draws in high and turbo modes?

In high it is (according to TK) most probably 2.8A, on Turbo it could be 15A, idk

Thank you, that helps me with my battery choices. 15A at 10,000 lumens seems low. the 40t should do it but I will try the 30t and Molicel as well to see if there is a difference. :+1:

Great review, thank you

You can share the results here if you want :wink:

I’m fascinated by the FW21 Pro to the point I’ve nearly purchased it more than once, but I’ve got my doubts that it will hit the claimed 10k lumens on turbo:

  • Assuming 3V XHP50.2, maximum rated current is 6A which just cracks 180% nominal lumens with top-binned emitters hitting 1328 lumens at 25C or a still-optimistic 1200 lumens at 85C so at max current you’re looking at 2160 lumens; Some hazy - and probably far too generous with diminishing returns and all that - math dividing 2160 by 6A suggests 360 lm/A thus you’re looking at ~9.26A to hit 3333 lumens per emitter or 27.8A
  • illumn ‘helpfully’ suggests NCR18650GA (10A peak discharge) and INR18650-35E (8A peak discharge) as compatible 18650s which probably aren’t going to do much for turbo, although they do recommend the INR21700-30T in 21700 which will push 35A

However, the review indicates that output is closer to 7000 lumens so the current situation changes:

  • 2333 lumens - 2160 lumens at 6A = 173 lumens / 360 lumens per amp = 480mA deficit so peak current demand is 6.48A x3 = 19.44A … a much more comfortable overdrive level
  • 20A is within the realms of more humble cells such as the Samsung 25R which I have many of

Thus … is this a real bump from the D4 / D4S / FW3A in terms of output - either at turbo or at a brightness level the light can actually sustain?

My Bangggood orders take about 30 days to reach me so I will not have my FW21 Pro till the 20th of this month. I do not have the equipment to test the light but would like to know the Actual numbers it will produce. Hoping someone here with the equipment who owns one will test it. I purchased it after watching a few videos on You Tube up against the NSX3A which I own. The FW21 looked a bit brighter then the NSX3A but with slightly less throw. It did surprisingly well against the Acebeam X10 and the Fenix Lr35R as far as output goes. Fenix LR35R - Nightwatch NSX3 NS53A - Lumintop FW21 Pro - Acebeam X10 comparison - YouTube

I have an integrating sphere made with pvc tubes and a luxmeter

None of my lights reach the Claimed lumens and throw, but I measure the FW21 at 10600lm. It’s the only light I’ve tested that measures over the claimed lumens, that must be something

WOW :open_mouth: Now that’s impressive! I was thinking at best around 7500LM to 8000LM. Did you use the 30T cell?

Guys, I did my best at measuring its output but my equipment is rather simple compared to some integrated spheres, but by far it was measuring accurately. My Wizard Nichia output was accurate, compared SKV89, the same thing with FW3A. But maybe it cant handle that high brightness well… I will try again, but I’m not gonna argue - you may be right, I may be wrong :wink:

Lacking detailed knowledge of your apparatus and lumen measurement theory I cannot much criticize your respective measurements. My root confusion is that >150% overdrive appears to be required to hit the manufacturer’s claimed 10k lumens - something that’s likely possible for brief periods but seems like it would strain the chain of components in the light.

I do suppose that perceived brightness is likely a step up over the FW3A’s nominal peak turbo output of 2800 lumens being more than double at the lower end of ~7000 lumens. The case vs the D4/D4S isn’t as clear with its purported peak output of 4300 lumens and thus not even double. In both cases, a casual assessment of that turbo output suggests that no overdrive is necessary . Of course, with markedly different LED characteristics and optics, the difference muddies appreciably and the main difference may well be floody reflector vs TIR.

My FW21 Pro showed up today and it is nice. My only gripe is the finish. It is very slippery with no texture for gripping. It is a very SMALL flashlight lol. When I put it in the palm of my hand and make a fist it disappears. The fit and finish is great, the switch is a little to soft for my liking but over all a very nice torch. It gets hot fast in turbo! lol. I am able to hold it threw its cycle but just barely and it stays hot for a while. The top of the ramp is just about perfect for a torch this size. It throws a wall of light out extremely well. The strobe mode it intense lol and should have a rating of 10 on the Richter scale, Extraordinary! Something about the three emitter strobe patterns, awesome! This is definitely a torch I will not be double tapping in turbo mode unless I need a small nuclear melt down or to fry some bacon. Very happy with my purchase and the price point. :smiley:

It could use some grip texture or somethin, i like how olight has those black rubber pads on the seeker 2 pro… almost impossible to slip with that light in hand. but i feel fw21pro is ok to hold thanks to its weigth with the battery, but can understand some wanted maybe a little better texture orso…

Hi, I didn’t say I had changed the maximum ramp level to 133 to get something close to the 2,000 lumens held, I feel the misunderstanding.
My FW21 Pro gives about 1350 lumens with a 40T at the original ramp maximum and about 850 with a 50E.
The 2.8A stabilized mode, as you announced, is at level 130.
On turbo the maximum lumens I get at the start with a 40T to 4.18v is 9,200.