I went further and decided to look at older versions released before 2019. Since after 2019 they changed their drivers and stopped making those that named "constant lighting". I think this is related to the promotion of their proprietary Core battery. After 2019, flashlights with regular batteries again show a smooth decrease in brightness, as shown above in the Aria-1 graph. With the Core battery, some kind of stabilization may be enabled, but I can't say for sure, since I don't have it yet
Here is Tikkka+ until 2019. There is no PWM at any level on all colors (white and red diode), at least not visible to my eyes. Inserted 3 batteries Enelup Lite 550 mAh. Tested at the brightest level of 110 lm
Almost matches what the graph on their packaging shows. If put it in an IP68 case and give it the ability to connect an external unit with 18650 while maintaining the ability to use 3*AAA, it would be an very good tourist flashlight in my opinion. It's sad they discontinued it, but they still pop up on the secondary market ~15-30$ and sit unsold in some tourist stores. As I see it, unlike modern flashlights, which are fixed on sealed plastic rods, screws are also used here, so it is easy to disassemble and insert a diode with high CRI. The secondary red has a smooth round spot, the brightness is about the same as the weakest mode of the main white light, good for walking on a path, but in a tent at night it will blind you just as much as white light. The primary beam is butterfly shaped, there are no strong color distortions, it is quite convenient for most tasks, although I would like a wider hotspot
