I participated in an expedition to Kilimanjaro organized by Expedition Travel (Ola Skinnarmo and Jonas Sundqvist). You can read more on www.expeditionsresor.se. We were a group of 15 participants including Swedish guides and domestic carriers. We took 7 days to reach the summit Uhuru Peak (5895 m) and back down.
During the day, I would strap HiLight onto my backpack and at night, I would hang it up on the roof of the tent and it gave a general good lighting to the surrounding. I also used it to charge my iPhone twice during the trip.However, there was a problem with HiLight when we got up to about 3000m. The lamp lit by itself without me activating it. I pressed the button to off it but it lit up again. Maybe it was the high air pressure due to the height that caused the problem.
Apart from that, I have no other views on improvement. The switch should be able to close so the HiLight does not turn on accidentally.
Photograph in courtesy and by Mats Andersson