Reddit mentions of NiteRider Commuter Helmet Mount F/Cordless & Mako

The NiteRider Lumina Micro 650 is pretty reasonably priced.
Says 1.5h run time on high.
USB rechargeable!
https://www.amazon.com/NiteRider-Lumina-Micro-650-Headlight/dp/B07FPYN8N7

Niterider helmet mount.
Works well on my helmet.
(straps through your vent holes up top)
https://www.amazon.com/NiteRider-Commuter-Helmet-Mount-Cordless/dp/B003Z8AK3Q/

Fenix bar mount, rugged and really adjustable. Fenix makes great flashlights but pricey.
https://www.amazon.com/Fenix-ALB-10-Flashlight-Mount-Upgrade/dp/B01FBABI90
this appears to be the same mount but cheaper (maybe import knock-off??)
https://www.amazon.com/FOME-Quick-release-Bike-Mount-ALB-10/dp/B00K6B6OGC

Flashlight. I've had good luck with this Light so far.
Infinitely adjustable brightness. (one click on - click and hold to DIM or brighten to desired level)
USB rechargeable!
https://www.amazon.com/ThruNite-Micro-USB-Chargeable-Flashlight-Self-define/dp/B06XWXVZH7

I have NiteRider 1100 Lumen combo. I had 2 mount point on my handlebar and helmet. I love using helmet mount because it allow me see better in curve road and also it's more easier for me to look away from other biker/driver so I don't blind them with my bright light.

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Just my 2 cent. More faster you riding (18+MPH) OR on bad road, you'll need higher lumen. Slower you go, lower lumen you need.

NiteRider 1100 OLED/100

NiteRider Lumina Helmet Mount Strap

I have one of these mounted to my helmet with one of these. They used to make a version with a flashing red light on the back but I haven't been able to find that in a while.