I bought this last year for my wife to try night riding and TBH she’s not used it. It’s a great unit – works well on the helmet or the bars and whilst it’s output is not huge (1200 lumen) its more than enough for a couple of hours in the woods. I’m a big fan of Gloworm lights also have an XS and an X1 (see below) but it’s sat doing nothing and I have other options if she does want to go out.
There’s plenty of info online:
https://www.bikeperfect.com/reviews/gloworm-alpha-light-review
I also have an X1 which has been super-ceded by a Four 4ths Scorch – I’ve got helmet and bar mounts, a charger and the strap for using it as a head torch – I have a 2 cell non Gloworm battery that works well with it but I’m not sure how old it is – I’m not sure I want to sell the X1 but if anyone is interested I can sort out pics and a price.
I’ve also a few unused chargers, mounts, lenses and other bits if anyone needs anything.