Lumintop GT4

Yeah, First mark the orientation of the top of the carrier. Then remove the hex screws from one end of the carrier and you can pull the end off and remove the center pcb’s. Then just reassemble in the same orientation it came apart.

hell this seems better than with the red sliders actually; just slide the clear sleeves up half way and tighten the battery container tail cap down real good and it’s more firm that before

Yeah, it is easier to use like this but you have to be careful since it is now possible to put a cell in backwards and short them out possibly leading to an explosion.

I was thinking about removing the center pcb’s on my GT94 because they seem to bind in the rods that they slide on. I mark my Li ion cells with little + and - signs all around the circumference of both ends the cells, because sometimes I am thinking anything else while I am inserting a cell.

Woo boy this thing is bright… what’s the runtime on turbo does anyone know? At least the calculated on 3000mah batteries? Seems like 3000mah/21a*60 = 8min32seconds… is it really that low?

Also, is there no way to set turbo at the top of the ramp?

I think I got around 18mins on turbo before LVP IIRC, it was in my review of the prototype.

No way to adjust the top of the ramp sadly.

Ah, I think you are right:

4s2p would be 6000mah/21a*60=17min20seconds

Sucks about the firmware

Come on, explosion? More like outgassing and sparks/fire if immediateaction is not taken. For an explosion you need a way for pressure to build up.

Insert said outgassing cells into sealed flashlight tube, pressure builds, something will give.

Now obviously we are not talking hand grenade here but the blowing out the lens into shards of glass is quite possible and something I would not want to be around.

Ah, your thinking the person will not notice the shorted cell and then have time to install it in the flashlight and seal it up. I would think that it would be noticeable well before it’s installed.

Most of the time the pressure will escape through the switch or through the lens. Very few lights are actually sealed tight enough to build much pressure.

When you said explosion I’m picturing a bomb or grenade.

Good cells can take ~30 seconds to start outgassing, if the last cell you insert was the one that shorted, that is plenty of time to insert the pack and put the cap on before it became noticeable.

Mostly just making people aware of the risks with removing the center PCB’s, most likely it would not happen but they need to be aware it is possible.

So you wouldn’t notice any sparks or smell anything burning?

I’ve never shorted a cell, so I’m curious.

Depends on the situation but yeah, it is possible to short them and not notice anything for a bit afterward except the cell is getting hot.

I shorted a few for science back in the Q8 development and it was really not all that impressive for the first few seconds, I always stopped after 5-10 seconds as I didn’t want the cell to actually vent but got them pretty warn in that time.

Is this one of the drivers that can be flashed with different firmware? Can i switch it to the other normal version (the toykeeper one like the astrolux lights have) ?

Yes, it uses a normal ATtiny85 and the same firmware/setup as the GT70.

The GT4 driver even has the programming key on the bottom of the driver allowing you to flash it without removing the driver.

That said I do not know is anduril has been made for the GT70 or not.

Has anyone reflowed XHP70.3 HI emitters into a GT4? If so, Id appreciate your impressions.

I’ve considered the swap, but not sure I want to give up the intense wide flood beam (although the HI emitters are still likely to provide a massive amount of spill-beam). Ive read a few times that the XHP-70.3 HI performs as a much better thrower than the XHP-50.3 HI after similar HD emitter swaps. That surprised me and adds more credence for a potential swap.

Didn’t even know the 70.3 hi was a thing.

I don’t know anything about it but I don’t see any reason why it would not work. You would loose some flood of course but there is so much to go around with this light that I am guessing you will not miss it that much.

Google finds several out there, but none for the GT4 that I could find. Here’s a thread I commented in.

Id like to find out if Id need to refocus the GT4 reflector before proceeding, which is sometimes the case after dedoming or HI swaps. That for me has always been the frustrating part of surgery!

Agreed! The GT4 should still created one hell of a flood beam with 70.3 HI emitters.

Oh, and thanks again for all the hard work you and others have done in bringing this monster to fruition. I hope yours still gets some good use!

I’ll be putting an XHP70.3 HI into a GT70 pretty soon. 3000k 90+ CRI!

Very nice! I hope you dont need to set the emitter deeper into the reflector. Please let us know how it turns out.