Group Buy Now Live - BLF GT90 SBT-90.2 powered 5,000 Lumen, 1.8Mcd / 2600m Super Thrower

Hmmm. never posted pic’s of how my GT with the 90 kit turned out…

. Group Pic… GT-90kit TN42 mod TM36mod FT03mod

Hot Spot Shots…

Nice family photo there, I took my own a few days ago but forgot to add in the chuckles side of the family, aka, the micro and mini.

I might just post the link for those interested in my GT90 conversion.

True DIY spirit there. :+1:

Been awhile since I have really dug into a light like that, in some ways I miss it and in some ways I have had my fill lol.

Closest thing I have done recently was a custom GT90 I built for a member on here back before the GT90 was released except with a wavien and aspheric lens. I am actually kinda surprised no one spotted my prototype version of it in the family picture above, it is subtle.

:+1:
Now that you mention it, that bezel is not standard!

Any info on that?

Not really at this time, the project is sorta finished as I could not get the wavien collar focused perfectly due to the wires being in the way.

The only real option for fixing it is going with a smaller mcpcb that would fit inside the collar but then the wires would still be an issue.

I got it to like 90% of perfect focus and it was determined it was good enough for now. If I can find a 20mm sbt90.2 mcpcb I might work on it some more at some point.

Throw was pretty good on it, forgot the exact numbers but it was WELL north of 2MCD IIRC.

I could buy it,from BG or Neal,together with the batteries,but it is insane to buy a new charger,as I already have 4 of them,having ordered today the new Miboxer charger with the coupon…
I prefer BG because they have a special delivery option,which is way better for me.If Neal can,as with the BLF GT,(which I bought from him),to use the same system,then I could through Neal as well.

Only way to know is to contact Neal and find out.

I searched the site, Search: 44 results found for "blf" – Nealsgadgets ,and I saw two flashlights with the same “name”,one at $349.00 and the other at $410.00.What is that?

The $410 one is a kit, with batts - VTC6's, and a charger.

Got some good news and sad news about the GT90 kits.

Good news they showed up today!

Sad news, they only sent 5 sets of carriers :person_facepalming:

They said they will ship the missing carriers “next week” but lets just say I have heard that before and will believe it when I see a tracking number.

I have an extra set of carriers I can spare from my personal GT90 for the time being so that gives me 6 kits I can ship now.

Not sure how to decide who gets the first ones, forgot exactly what order people signed up in.

Thinking I might get everyone that wants a single kit taken care of with these, looks like there are 5 single kit orders.

Unless people with multiple kits would like to split up the shipments?

Or I can wait to see what happens next week and ship them all together after the other carriers show up.

I will split my order of 4. I have a spare set of carriers anyways.

I was thinking on it and I think the only fair and unbiased option is for me to use a random number generator and the first 6 numbers it picks get first dibs.

Those with multiple kits will have the choice of splitting the order or passing for now and waiting for the remaining carriers.

I will send PM’s out in a little while with payment instructions.

I'm very interested!!!

Interested in the GT90 or the GT90 conversion kit?

Sorry Texas_Ace, I misread the post. I thought it was the GT94 thread.

I have a GT90 already, but I don't want to mod it. Thanks for replying.

K - completed my first GT to GT90 conversion with the kit and it's pretty impressive for sure. I measured 1810 kcd on only 4 30Q's at 4.15V. I used the shorty tube.

Hard to measure lumens but I'd guess about 5250 (mine) at start, maybe ~4800 calibrated lumens.

Charging up VTC6's now, solder blob tops.

Update: With the 8 VTC6's, I did measure a little bump. These are old VTC6's, like from 2017, but not sure how much use they really got used.

  • Measured 1890 kcd taken at 5 meters
  • Approx. 5600 lumens (mine), ~4950 calibrated lumens

Now I'm wondering if some mods may help, like:

  • swapping out the SIR800DP FET for a SIRA20DP
  • spring bypasses
  • 20 to 18 AWG wire upgrades
  • using higher performing cells like the Samsung 25S or SONY VTC5D's

Has anyone tried any of these type of mods?

I would think taking the throw at 10+ meters would bump the reading, but to me, actually at 5 m the hot spot looks pretty good.

I opened 2 more GT front bezels for doing the same conversion kit upgrade. Had to clamp the head down in pine boards and then use a strap wrench on the bezel. One took a while to get open, while the other 2 went easier. Didn't expect it to be this hard - thought I could get by with grippy gloves but it's awkward to get good pressure on. The strap wrench did not slip 1 mm - got a great grip with it. It's the most amount of pressure I've applied with a strap wrench, and this was for a light without glue!

Driver, MCPCB, and centering piece. Shown are the shorter stock screws and the longer ones I chose to use instead - Phillips flat head 2mm x 0.4mm x 8mm. The heads fit snugly in the centering piece hole, holding it down with modest pressure.

The FET is the SIR800DP - not sure if it's a clone or not. The wires are 20 AWG which I decided to stay with. Because they are doubled up, it's probably equal to a single about 18 AWG.

Compared to stock, same width but the 90 is slightly thicker which is a good thing:

With oversized holes, it makes it impossible to center the LED from the centering piece alone:

Flat surface sanding with 2000 GRIT paper shows the MCPCB is not perfectly flat on the bottom. All around the holes the surface was lower, perhaps slight deformities from the hole drilling in soft metal like copper. Usually I would drop to rougher GRIT's and get it smooth, but I figure there's enough surface area smoothed out and differences are minimal.

Applied healthy amount of MX4. The Stock light had maybe 60% coverage:

Fully assembled. The pre-tinned pads are done with something high temp, like lead free solder. Next one I'll be sure to remove as much solder as I can before assembly. Turned the iron up to 750F just to be able to melt it.

I would say the end result has the LED pretty well centered, though I'm sure not perfect. Hot spot looks very good.

Note: the carriers in the kit had most screws untightened, and the brass contact pieces were loose as well. Easy to check and tighten. A couple of screw heads were slightly stripped but could still tighten and loosen.

Strange that the driver seems to have contact points for flash re-programming, but they are on the inside, not the backside.

Nice job!

I didn’t notice the loose screws on the carriers or I would of tightened them before shipping, didn’t even think to check that. That is something people should check though.

The driver was not designed by me, they adapted the GT70 driver to 3V without my help for some reason. It works though and still uses the same parts/firmware (except for some resistors).

The new GT4/GT94 driver does have programming pads on the bottom for lexels programming key, I keep trying to get them to use it in the GT70 as well.

Thanx! I finished my 2nd conversion kit mod. This time, I swapped the FET for a SIRA20DP and swapped the 4 20 AWG LED wires to 18 AWG. Also I re-programmed the driver with Anduril2.

Re-measured #'s and did get a bump in throw and lumens, but not all that much. Actually the BT 30Q's got a bigger bump than the solder top VTC6's -- could be from more compression from the springs because the BT 30Q's are a little longer.

I also re-measured the stock BLF GT, and at 5 meters, it's ~950 kcd while the conversion kit lights I measured at 5 meters are 1,850 - 1,950 kcd. Wondering if 5 m is too close for focusing of the XHP35 HI, while the SBT90.2 does much better at 5 m, at least in the GT reflector.

I also noticed the cells fit much tighter in the 90 carriers than the older GT carriers. Looks like they are intentionally designed this way. Actually I got some BT 30Q's that don't fit in the 90 carrier, but most of my BT 30Q's do fit, fortunately. With the cells that fit in the 90 carriers, the springs are just about fully compressed so probably no bump from adding bypasses.

Extra jumper for LED+ wires added and reflowed SIRA20DP shown:

18 AWG wires:

I started with 600 GRIT and still could not get the full surface sanded smooth. so I took a large punch and hammer and gave it a couple taps on the top. The bottom then got real easy to sand smooth. Now there's only non-sanded surface areas near the edges and around the holes:

Stock MCPCB from the GT (XHP35 HI):

18 AWG wires shown:

I believe this is bouncing off the low cloud cover. I took a few shots at different settings and this one looked the best reproducing what I was seeing - beam looks NW, nice bright hot spot with a halo around it. It's been misting and drizzling all evening. Measured 1,975 kcd taken at 5 m on this one:

The old BLF GT seems to be sooo outdated now.