Like a kid, the HC90 just arrived and the batteries have been placed in the charger.

I installed an Orbtronic 3400 mAh 18650 to power the light.
In a room, the light doesn't show well during the day and the beam is easily overridden by the bright beam of an EC4 but at night, the HC90 has an excellent, wide, close in fill and as the headlamp is turned, everything close up or in close trees is brightly lit up for fifty yards. Overall, the HC90 creates a very nice beam that for under a hundred yards, is very usable.
The only problem I can see, worthy of comment, which is not the fault of the light, being at eye level, all the material that's floating around in the air is illuminated and distractingly reflected back into the eyes. In my opinion, this is a walking light, not a stand-alone light but a light that is well served being backed up with an EC4 or a TM16.