Lumintop GT4

It is not extremely chunky inside the head, a lot of volume is converted into finning, but fins have mass also of course, so yes, the head has a bit more volume and will be heavier than the GT. I’m really curious about what the sustainable light level will be actually, large flashlights have an unfavorable volume/surface-area ratio so scaling the power up from a smaller light requires disproportionate measures to create extra surface area (=fins). This is attempted in the GT4 but how the final sustainable output proves to be is a surprise. I hope for over 10K lumen with the head kept under 60 degC. (that will drain the batteries in say 45 minutes, so sustainable is relative :slight_smile: )

Classic lumens/thrower with more emphasis on the lumens (XHP70.2's). The Shocker had C8 size reflectors, looks roughly these are about the same size - Shocker had a smaller head diameter with 3 cups. Of course XHP70.2's can't compete even with a XM-L2 in throw, but maybe are closer when driven harder, and in the stock configuration, should beat a Shocker in throw for sure mainly because of the FET based driver and high amps.

I can’t wait to see some numbers on this bad boy, and hopefully it has a nice clean pedal free hotspot.

I think Dale, did a XHP70 mod to the Shocker - would be interesting to see what #'s it got.

Post here: https://budgetlightforum.com/t/-/33156/16, but no throw #'s.

It is about time for extra battery tubes. Those 70.2s will be hungry!

8x18650 is a plenty of battery power :slight_smile: For the GT/GT70 I think it was more of a too much,4x18650 would be good too,but for GT4 8x is enough

Interested!

I think XHP35 in GT is at or just under 150 cd/mm². Well cooled white flat is over 300 at peak, a little less in a regular fat host like GT. Boost HX should be even more intense. So… 75% higher LED intensity, 260 cd/mm²?

You would have to lose 43% elsewhere to end up with equal throw. What are the losses elsewhere?
Area loss. Not that high with a siamesed 7-up, especially that you can make the reflector cups very deep.
You may also lose a bit of throw by worse centering.

Am I missing something?

Nope you are not missing anything, your numbers sound good to me but I always under-promise and underestimate when possible.

which emitter is the white flat?

Osram KW CSLNM1.TG.

Is it the best for long throw?

Currently, it is the best. But the Boost HX hasn’t been released yet. :wink:

This is the farthest throwing LED we’ve seen so far. I believe Boost HX is in mass production and should be better but we’re not able to source them yet.
There may be better LEDs that we haven’t tested.
And there are emitters better than LEDs.

I can’t wrap my head around the diameter being the same as the GT70, but split into 4 smaller reflectors, AND throwing just as well as one well made GT70 reflector…?
I can see that it may throw insane lumens down range, but at some point wouldn’t it just ‘flare out ’?
By that I am imagining the 4 beams not being as tightly… collimated? So then at 500 yards the beams disperse….?

I traded GT for GT70 for more lumens downrange, de-domed to reclaim Some throw… but this new one confuses me…

It’s basically going to have the same throw, but the beam is going to be much wider due to much higher surface area and lumen output.

Because of this, the lumen/candela will be about 4x lower compared to the GT70.

Multi-emitter lights in my testing are generally a bit lower then a single reflector of the same size but not much lower.

The lower throw per emitter is made up for by having more emitters and more raw power.

Just what I have noticed over time. It is not a iron clad rule but has served me well.

Guaranteed at least 1.

:smiley:

Maybe they can take the extra ten seconds to make sure the flat of the battery tube lines up with the button this time instead of being a lottery.

Also this reminds me visually of my old Howitzer, which I loved but didn’t have the output you’d expect in such a huge torch today.

Sadly it is not possible due to the way the machining works. It has been tried many times but it is simply not possible to make it line up without a lot of manual labor to grind each piece individually by hand pretty much.