My HO3 NW arrived today from gearbest sale a few weeks ago. Very impressive light, havent tried the headband yet, but so far so good, great output and tint.
was just curious about the turbo lumen specs, says 1200 on box and in manual description, but runtime charts in the same manual say 900 for 18650, and 1000 for 2xcr123’s, wondering what is correct? I’m guessing 1200 is the emitter lumens and 900/1000 is after it goes through the optic?
1200 LED lumens on box
1000/900 OTF
Mine gets around 900 lumens on turbo.
mine with Narsil driver about 1400-1500 OTF lumens
Wow pretty impressive. I’m gonna try the narsil driver you sent me with a xhp 50.2 .
is there a thread for assembly of the headband? feeling pretty stupid right about now and the manual is not helpful
Long piece goes around head, short goes from back to top of light mount.
You have to fold a portion of the band and squeeze it through the opening in the middle of the adjusters, from the underside.
Here’s a link to a partial view of the assembled headband:
http://www.skilhunt.com/wp-content/uploads/2018/01/3-1.jpg
Check the customer reviews on the following link, there are some users pictures of the assembled headband.
https://www.gearbest.com/led-flashlights/pp_391921.html
thanks i got the center strap with that pic, still working on the long band
Cool, think I got it now, for some reason I thought the darker color would be on exterior only, so was having trouble putting it together, but the pic helped, thanks again
I just received my H03, and directly placed a NRC18650B in it and tested it.
Directly I liked it. Nice even light to work with.
The headband I think is not super great, but works fine.
The magnatic tailcap is a heandy feature.
Oncoming weak I’l test the light during work (I work at dark places 
).
First impression: Great little light! (And yes, it is a small light!).
I assume that your head light has the Narsil ramping UI. Ramping would be amazing on this headlight.
Loving the H03 :heart_eyes: .
Now driving of to a problem with a heating boiler, glad I can use it again :).
I’l later post some review story of what I think working with it, bud so far…
I measured 1.5A max at tailcap with my H03, I assume that’s not enough to get 900/1000lumen?I’ve tried different high drain 18650 batteries, but all the same current
Edit: I got 2.2A with 2x cr123A @4V each… that’s 17W input vs 6W(4.1V*1.5A) with the 18650 batterie, or am I thinking wrong?
You should get about 3A with an 18650 for ~1000 lumens: XLamp® XM LEDs Archives - Cree LED
Are you using a clamp meter? A DMM will give you a lower reading, although I have no idea if it can reduce current down to 1.5A.
I measured exactly the same currents with a clamp meter.
I don’t understand the big difference between power input of a 18650 and a 16340 battery
CR123 calculation is wrong. First, voltage of CR123 is rated at 3V. But under load of approximately 2A you get a voltage of about 2.25V: Test/Review of Panasonic Lithium Power CR123
So 2 of those in series you get 4.5V, and P = 4.5V x 2.2A = 9.9W.
This is the correct value for something like an XM-L2 emitter producing about 1000 lumens. This can be seen again in Cree’s specs: XLamp® XM LEDs Archives - Cree LED
It says 10W @ 3A
Of course you still need to take into account driver efficiency, but I’ve excluded that for the time being.
So your light is working fine using 2xCR123 cells, but is doing something wrong using a single 18650 cell.
Many thanx for the explanation 
OK sorry for the potentially stupid question I’m going to ask. You know that by double clicking you can toggle between two outputs right? So in high/turbo you toggle between something like 1000 and 500 lumens.
Yes, I did know that 
The H03 is rated at 900lm with a single 18650. With rounding and marketing included!
(there is also 1200lm printed on the box)
I think Skilhunt tends to exaggerate stuff, so the low amp reading is OK.
With an added second magnet it is my favourite EDC.