For what it’s worth, I’ve continued working on the thermal regulation. It has a tighter window now, a smaller range of temperatures it’ll accept… so it stays closer to the configured temperature. I also got it to adjust faster while still not overshooting or bouncing.
The runtime graph isn’t completely flat any more, but that’s probably a good thing. On a linear driver like this, it gets more efficient as the battery gets low, so it makes less heat, and then it naturally increases the brightness to maintain a steady temperature. This effect is fairly small though, and happens very slowly, so it’s not visible by eye.
It is not necessary to use the flashlight only in turbo modes. In weaker modes, the XHP50 will be more efficient and less hot than small XPL/SST… .
I hope Hank pay attention to the emitters XHP
As always, we offer various different CCTs if we decide to offer one type of LEDs, 2000, 3500K, 4500K, 5000K will be offered when they are available.
But there is no ETA yet since the Japan Nichia factory is locked down.
If what he listed are the actual CCTs of the emitters I imagine mixing tints will be an option like it has been on other Emisar lights. That would make for many options in final temp (and with better tint too).
Ever since the original D4 came out, people have been asking for a specific type of light which Intl-Outdoor has not yet made — a single-emitter EDC-style light. Basically, a Noctigon version of something like a ZebraLight SC64 or an Olight S2.
The D4 makes about 4 or 5 cd/lm, while the D1 makes about 33 cd/lm. Between the two is a hole in the product line.
The goal would be to fill that hole with something as small as possible with 18650 and one LED — narrower and lighter than a D4, with thinner walls. The beam pattern would be about 10 or 12 cd/lm. Ideally, with a deep carry clip which is straight and runs parallel to the body. The body is probably about 21 mm in diameter, the head is as narrow (or almost as narrow) as the body, and the light is ideally under 100 mm in length if possible.
Something like this would work well with a regulated 5A driver. For the LED, it might make sense to use XP-L HI, XP-L HD, LH351D, or 4xE21A / 4xE17A arranged together so the LEDs touch each other.
The choice of optic or reflector probably depends on which LED is used and how throwy it is. For example, XP-L HI might work with a frosted TIR or a heavy orange-peel reflector, while LH351D might work better with a clear TIR or a light orange-peel reflector. It would require some experimentation to produce a nice-looking beam with the right amount of candelas per lumen.