I have the Haikelite HT70. Mine didn’t have any problems even if running on Turbo with 8 VTC6 batteries.

It does get hot fast, which I take as a sign of a good thermal path. The cooling rips are deep and the knurling is very grippy. It is a very nice flashlight, maybe with SST70 5000K or even 4000K 95CRI it would get the attention it deserves. They could also put in XHP70.2 leds to get a smaller GT4. But Haikelite seems to sleep these days.

So far I didn’t open it because the Haikelite flashlights are always a bit complicated to open with the reflector screw. If my SST70 leds would fail I would replace them with dedomed XHP70’s.