Full regulated means the light will be on constant brightness, but suffer shorter run time, as a small light, battery runtime is important, IMHO, so I will not asked for fully regulated circuit.

Buy the 47 mini 123, haha I have 3 

They both go VERY HOT!

The diff. is that Ti stays hot in the head. Heat does not move well. Alu transfers much better.

Alu is better for the LED. Ti is tougher overall and more durable but scratches VERY (mirror polished) easily.

Alu threads are MUCH smoother.

Ti is more exp. (duh?).

Ti is prettier and more exotic.

I think I covered pretty much everything.

Oh yea 1 more. Ti has a longer waiting period than alu, wahahhaa!

Hi Capiche, it's not a matter of how hot it becomes but how fast it'll dissipate heat. Titanium is not a good heat sinking material as aluminum. Although tougher, it does shine cosmetically better

If you know how to effectively manage the heat on the Quark Mini 123 Ti then it should be fine. Personally from my own research, it's okay to run the Mini 123 Titanium on high, but there's a lot of heat back-firing it overtime. XPG LEDs are very heat tolerant, and more tolerant than XPE or XRE. But they do still degrade by excessive heat, especially trapped heat. Degradation may not be noticed from the phosphor but it is unseen and it happens on the LED chip. You may not get the full life potential of 30,000 - 50,000 hours.

On practice, I don’t think I’ll let the Mini 123 Ti run on high more than 2 minutes. Perhaps this is already sufficient in whatever you’re doing? I’m using the Mini 123 aluminum and it’s mostly used on medium. But, given in an emergency situation where you really need the Ti to run more than 2 minutes, perhaps it can go up to 10 or until the battery depletes.

Use veseline is better then silicone grease.. silicone turn grey / black after use a few times. Deoxit also a good choice.