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

With qty 10 of XHP70.2's putting out a total of 25000 lumens, it would use about 150 watts.

Of course running under wall power, we are not talking about a flashlight, but rather auxiliary lighting. It's really outside the realm of what we do here.

I dunno what those heatsinks look like, specially interested in the ones you mentioned for less than $50 -- do you have a link or 2?

Yep, I have considered many of these things as well. As djozz pointed out earlier, besides the technical limitations, the biggest hurdle is cost.

To make a light with a Noctua style heatsink you would easily be pushing the price over $1000, most likely WELL WELL over that since it would be a very small quantity light and thus very few lights to spread the R&D costs over.

That said, Djozz box light idea is the best compromise I have heard so far but still presents a lot of design and manufacturing challenges. I have put feelers out for such a light a few times but everytime decided to not pursue it as the manufactures were just not ready for such a light.

It will be a big departure from what they know and having been behind the curtain so to speak, I just simply have not found a manufacture that I think could pull it off properly yet. That is even before trying to convince them to give it a try knowing there will not be much profit in it (which means it would get even less attention in the design phase when it needs far more).

There are a few lights people have put together on youtube using CPU water coolers for big output, they are really neat but very hard to turn into a practical flashlight.

Interesting stuff!
I barely use my GT90, but i’m still super happy with it. reports a noticeable difference in output between the GT90 and MF05 though, so it might be that in real life the difference is barely noticeable.
Another reason to stick with the GT90 :wink:

K, that thing is huge! -->

The radiator, thin metal design, and the heat pipes should be something that works well for LED's, but dunno if the watt rating is with or without the fans. If is was shaped and sized as something to fit a flashlight, might be interesting.

I'm thinking a massive size head of 120-150 mm or so, with 10 XHP70.2's so 10 mini reflectors. The LED mounts will be fairly close up to the bezel, therefore you got a lot of potential room behind the LED mounting plate to fit a sizable heatsink. Then the cell pack should be rectangular with a handle. So I'm envisioning an old style carry, like a Maxabeam, but more of a flooder than thrower.

A COB is an option, though not familiar with the specs or efficiency (lms/watt). I chose the XHP70.2 more because of the efficiency at lower amps, not so much cost.

Think the XHP70.2 P2 at 2.5 amps each is like 177 lumens/watt, using TA's sig line link to the XHP70.2 P2 output tests.

Well after 6 months of waiting the last of the GT90 kits FINALLY arrived!

I already sent messages to the people still on the waiting list.

At least one has understandably decided to not finish the order so I have 1 extra GT90 conversion available to anyone that wants it.

You can send me a PM if you are interested.

PM sent about extra conversion kit.

these use BUTTON tops , right?

like 15amp VTC6 cells, or……?

Looking for a source for 8 for a friend and his GT90

Looking at this picture, credit to 1Lumen, it seems you do need button top to make contact.

Typical workarounds would be to remove the reverse polarity protection board or else you could solder blob flat top cells. Small magnets may also work, but it is probably not worth the risk of a short circuit.

Yes, all the large GT based lights have polarity protection and need button top cells.

The risk of a short circuit with 8 cells in the carrier is just too high to not have the polarity protection from the factory.

Of course what you do once you have it is your business but not supported.

Personally I just solder blob all my cells, works great and allows me to retain the polarity protection. I will admit I have put cells in backwards before just from not paying attention.

Anyone have a conversion kit to sell ?

Have you seen this?

Nope, I had not, nice build there Djozz!

Interested in converting my GT to a GT90. Is there a source for conversion kits or a part list?

Sadly I sold all the GT90 conversion kits and they are not open to selling me more last I checked (plus not sure it is worth it, took me over 7 months to get the last batch in).

Doing the conversion manually is possible, there is a thread of someone that did it but takes a fair amount of extra effort and work to make it happen and still counts on getting some of the parts from lumintop.

Did you mean THIS ONE ?

Yes, that is the one.

BLF GT90 with short tube.

For sale? :smiley: