The BLF GT70 "Giggle Monster" is here! 7,500lumens, 1,500m throw! Group buy Closed!

Got my GT70 today, one day earlier than planned. (taxes and fees: ~70.- USD, so less than expected)

Output really is impressive, still have to do some measurements (just using ceilingbounce)

Included are the already expecting narrow battery carriers and unfortunately a reflector in a not so mint condition....

There seems to be a dent on the reflector.

I have shot some pictures to display the issue, all of which can be found in this album:

BLF GT reflector issue Pictures

The dent is clearly visible on the reflector and also on the white ceiling.

a shadow in the corona at 8 o'clock:


Even if the effect on the output will not be very high, I am not very happy to get a B-grade reflector..

Could it be, that Lumintop is now using reflectors that have been rejected in previous batches?

Maybe they can send me a flawless one....

Usually blemishes affect the beam, but since yours does affect the beam, you should ask for a replacement reflector to be shipped.

That is a very strange issues, I have not seen that before on a quality reflector like this.

It is also something that would easily slip through QC unless you were looking for it so pretty much positive that it is just a case of someone not seeing it and not lumintop using lower grade parts.

Contact leo for sure, they should send you a replacement.

Yes, I have not seen anything like this before, either…

I have sent a mail to leo now...

I guess anything is possible, but I seriously doubt they would do that.

I think yours just slipped through QC. A bad break for you, but nothing more.

They should definitely make it right though. :+1:

Boy that would be horrific to find out that we are getting factory second lights and BG is getting the A+ lights, just a thought because there is no way I could see Lumin ever doing that to us.
I see this product everywhere for sale and I always thought that when our team designs and has a GB that our members are all taken care of first and then it goes for public sales, I could be wrong or maybe a different agreement was made.
I’ve been fortunate since the first run and have gotten some pretty good reflectors compared to what I’ve seen in some pics since Dec. 2017, still has some spin ripples I believe it is but you have to look close for them.
And Lumin said they are worried about shipping a reflector by itself, it might get damaged, perhaps they should worry about shipping reflectors in the lights as well.?
Only thing that got me was those darn springs, had one stab deep into my finger the other night while looking for the springs that messed up some of my cells, 3 out of 8 cells I’ve gotten rid of and I bought 16 new from Liions, also been using my small file to file down the ends of all my springs to remove a 45 degree angled cut on the wire ends, that angle made those very sharp and some were turned upward not your normal 90 degree bend and that’s what caused what you saw in that one picture, that one spring could have worked a hole through that negative end for sure eventually, then I used my Smith Little torch to direct heat and bend the spring wire back down where it should have been, fairly difficult to do.
So that should fix my spring problems, nice and smooth now and all around fantastic light, now I just need to find a different LED,
I think I’ll get in touch with RMM and see if he will do the same thing he offered for the XHP35’s…
Thank you again TA for all your very hard work on this project, it is greatly appreciated…!!

My reflector looks a lot like the one Kingjohn posted. Obviously it isn’t as severe as it doesn’t show up in use, even when held close to the wall.

I have noticed the lens fogging quite a bit but I also noticed there is a hole in thr driver…

TA, DO YOU KNOW IF THE HEADS ARE FULLY SEALED? Would cracking the bezel open and putting it in a container with some silica gel be an option or will moisture in thr air just get back into the body each battery change?

The beam on mine is quite good, a bit cool but that was to be expected since I am more a NW fan. The ceilijg bounce app runtime function gave me a reading 4839 for 4x30Qs and 5186 with 8x30Qs. I should have tested the drop at 30s but am happy they are that close to start with.

One weird thing I noticed is the light clicking as it heats up and then subsequently cools off. Kinda like a the popping and clicking sound a tin roof makes when it undergoes thermal expansion/contraction. Anyone else notice this on theirs?

With all the minor “issues” I am still really happy with the light.

GREAT JOB TO TA AND EVERYONE ELSE INVOLVED!! Can’t wait to crack it open and dedome the LED and see what happens. Will likely order the NW when available and just leave it as-is.

That was changed this time around and I see it staying that way in the future. In the GT group buy a very disproportionate number of issues were the mere rumors that the light might go on sale somewhere else. Even though it was never said that BLF got first dibs, only that they got the group buy price.

I now make this clear in the OP to eliminate these issues and this is not an issue since lumintop has enough lights to go around this time, so they can fulfill all the orders equally.

Not to worry about one place getting better quality then another. All of the lights are in one giant batch and are not graded at lumintop. The individual parts either pass or fail QC. If they fail. they are sent back to the factory. This is why we could not get the rejected reflector from the first GT group buy.

The heads are almost sealed, the driver is just held in place by a retaining ring and there is a hole as you noted but when the light is fully assembled it is effectively sealed.

Yes, putting it in a container with some silica could indeed help.

The clicking is normal, it is just the metal expanding with the heat, this is much more noticeable on a large light like this.

If you can not see the imperfection in the beam even when held close to the wall, then it will have virtually no effect on the performance of the light. I have been surprised with even fairly large imperfections having little effect in the past.

Apart from the defective reflector, the output of my GT70 is great.

I did some ceilingbounce measurements comparisons in a very small room with white walls (guess where ;) )

Then calibrated the setup, so that the Acebeam K60 closely matched 5000lm...

So those numbers are more like aproximations and comparison numbers...

I used a Samsung Galaxy S7 to run the app "ceilingbounce" on....

Here my results (all on turbo/maximum output):

Acebeam K60: 5100lm
Emisar D4S nichia: 3400lm
BLF GT: 2100lm
BLF GT70: 9700lm

I was positively surprised, that the GT70 reaches >9000lm. Maybe the new carriers are a not so bad idea and do fulfill their purpose?

But the GT70 is going down quite fast, immediately after switch on from 9700 to ~9000lm in a few seconds...

I was using 8 fully charged 30Qs in the GT70.

K60 and GT are quite stable after switch on... (GT only had 4 full 30Qs loaded)

(the same setup returned 25klm and 30klm earlier, testing my Acebeam X80 and Imalent DX80, so I think its good enough for comparing flashlights.)

Some GT/GT70 Beamshots (using a Galaxy S9, unfortunately done using auto exposure, so both show similar brightness, though the GT70 is much brighter):

Control:

BLF GT (1/2):

BLF GT (1/2):

BLF GT70 (1/2):

BLF GT70 (2/2):

Thanks for the beamshots… last week when I got my blf gt70 and I seem some hint of green… green tint disappears or less noticeable this week. Maybe led get break in or my eyes…

I can see green color in the corona only. And only at lower output…
Maybe because at high output I get blind and no longer see anything at all on a white wall :cowboy_hat_face:

I have to say, I start to like this tint…

Maybe an XHP70.2 needs a good burnin first :wink:

Here is a couple shots of my Clean De-domed XHP70.2 P2-1A 6v GT compared to the GT70 Dome on P2-1A

I am perplexed.

The one on the left is the dome on I am guessing? Since it has a larger hotspot.

It is strange that the dedomed version seems to have less tint shift.

On one hand this makes sense, the dome is responsible for part of the tint shift we see.

On the other hand I have always seen the tint shift towards green/yellow when dedoming.

The left spot in this pic is the de-domed GT.
Don’t be perplexed, the tint shit in the lower modes is horrendous, I can’t stand it. But from 50–100 power it is a massive change in tint. Get rid of the phosphorous around the LED and the corona is greatly reduced on a shaved dome, complete de-domed LED, barely a ring, usually a blue halo from the sides of the LED die.

Now the clean de-domed LED only measures 6,200lm, it was making 8,500-8,800 depending on what batteries I used, before I shaved it really close (meh too close I guess) and diced the pad clean, but then after a couple Turbo blast, it started to burn, so I completely de-domed it. Smoked up my reflector a bit.

I just mostly run it in Turbo!

If it dies…. it dies…. :wink:

Left is clearly the dedomed one in the second pic, just looks bigger in the first pic probably due to higher spot brightness.
Also very clear tint shift to warm white/yellow.

There’s a lot of lumens being lost from slicing the sides off of the phosphor, since the phosphor on the sides of the LED also gets excited.

The right spot is the de-domed in this pic. Bluish halo around the spot, Brown/Yellow around the dome on.

Hi,
is it possible to be set on list for one conversion kit in NW.
Maybe NW dedomed?
Is output like in video in post #2: XHP70.2 Dedomed plus Mosfet?
Thanks a lot.

You just need to fill out the form in post #1 to get on the list.

Dedoming (technically slicing the dome off) is not a factory option. You will have to do that yourself. I think I’ve posted two videos of Vestureofblood doing it.

If your going to slice off the dome, the color becomes warmer, so it’s suggested by Texas_Ace to start with the Cool White.

Output will be like the video.

Thanks, I´ve filled it out.
Warmer Tint about 4000K would be great, so If I order one 5000K, it will be good for me after slicing.

sorry for stupid question. What output modes have TA driver V2 for this light?
And will be the illuminated switch also illuminated after changing driver / LED?
Thanks a lot.