Color rendering (esp. v. xpg). I am interested in hotspot and corona lux at 1 meter for each setting. Current, esp. at 4 hour setting (to see if we can go higher than 4 hour. And maybe diameter of hotspot at 1 meter. I am guessing the corona is a wide 100 degrees or so. Naturally, comfort and how short the cord was made.
Runtimes below 4 hours bore me, as I try never to use them. Ex. My worker ignorantly threw the HP11 into the 2.5 hour mode and couldn't finish his work day with the only headlamp on job besides a bt20, which he would never be able to wear, due to its bulk and short cord.
Ok bear with me, I'm not much of a light veteran. You lost me with xpg.
I can make some pictures of the beams at different settings at 1 meter for sure, but that will take a few days.
I can do an endurance run as well, mind you that I use 3400mAh 18650.
Luckily I do have a BT20 so I can compare the cord-lenghts. Maybe this light can help you explain the color rendering a bit more, for what you're after. For refence I also have Fenix TK41, LD20 and LD22, Olight M30, Nitecore SRT5 and EagleTac D25C clicky.
As for cord lenght... how tall is this guy? The BT20 with extention runs around 1.40 meter unless he's really tall that should work no? Anyway mailman just came by and here are some first impressions.
The cord is slightly longer running for about 1.50 (not counting the light seld or the battery package, so just the "string") So that makes about 10-15 cm difference in lenght. I should say that if the BT20 doesnt work then the HP30 won't either... (seriously, how tall is he?)
The battery holder appears slightly bigger, I assume this is to make room for the USB-charge function. It comes with a metallic holder that provides a clip / belt-clip. I'm currently charging the batteries so light impressions will follow. Same as weight and assembly etc.