Active thermal regulation in well designed driver/firmware like the Zebralights work very well. You don’t even notice the ATR kicking in but the lumen output stays much more consistent making it more practical for most use cases.
IMO ATR is no benefit on a thrower, and rarely elsewhere. Once it kicks down I’m not going to keep a thrower on and wait for it to ramp back up, never. Apparently I’m in the minority on this and that’s ok, I wasn’t actually trying to convince anybody to agree with me. You also don’t understand how versatile the R90C is if you think it needs it.
Really depends on how you use your light. For example, if you want to use your Emisar D4 as a tail standing work light, lumen output will drop down to 50 lumens making it useless for that application. It stays really cold at that output but does not know how to climb back up. Whereas a well designed light with ATR of that size will find an equilibrium temperature/output at about 500 lumens making the light very practical for unattended uses.
I was just about to pull the trigger on a GT70 but holy hell, looks like I’ll be waiting a bit.
I’m pretty excited about this beast! I’ve already been showing my wife pictures and talking about so there’s no surprise when a $400(just a guess) flashlight shows up.
The GT4 needs at least one heatpipe spiraled under the shelf, going outside of the flashlight, and rolled at the bottom of the head fin, which will be machined like a continuous large deep threading instead of separated multi || fins.
I’m only dreaming…
See a spiral at the center with a notch in the aluminum base for the heatpipe “go-through” (filled with thermal epoxy).
Compaired to my MF04S my GT70 is just just too HEAVY. Cant keep track of a moving target, and it gets just as unusably hot as the my astrolux after 2mins, then steps down. Will the GT4 be another Toy?
Well, knowing the GT70 has 8x18650s with an 8x18650 body with a bigger heatsink and higher power, it has to be expected.
Without batteries in the GT70 it is heavier than my MF04S with batteries.
I would love to do this as well but the cost would go up a LOT if we tried this, just not worth it I am afraid.
Plus early tests show that the GT4 has great thermal properties as it is.
The GT4 will have far better thermal properties then either of those lights, on turbo though it will of course still get hot enough to need to step down, that is expected with a ~300w light.
We are trying to get them to make a handle for the GT4 to make it easier to hold and it keeps your hand away from the light itself, so you could disable the thermal protection and it would not burn you if you desired (the light itself should be fine but will need to test to make sure).
It WILL be heavy though, that much is known for sure.
I googled “hot and heavy” and this thread was on the first page, unfortunately I was looking for non-flashlight porn this time
lol haha,… 
Google knows you and your preferences.
Lol must be true :+1:
You all have too many jokes.
So will the GT4 have options for other leds than 70.2?
What other possible led could be an option?
have you seen how beefy the head looks? its made for this type of emitters to absorb that amounts of heats those emitters will produce, doubt they have plans for anything else, but that depends if enough demand they might produce something after but dont count on it for now maybe…
There are no plans for other emitters at this time but the design is such that DIY mods should not be hard. You could use 3v, 6v, or 12v LED’s without much trouble. You would just need large ~26mm+ mcpcb’s for them.
An XHP35 version was considered but honestly you might as well just get the GT70 as I expect that the throw and output would be similar. The only benefit would be better tint options but that is not enough for most people.
A boost HX version would be interesting to consider once the LED is released but till then it is impossible to say if it would be worth it.