Review on NiteRider Lumina 900 Boost: Powerful USB Rechargeable Bike Light for All-Terrain & Road Riding - Enhanced Lumens, Water Resistant, Easy Installation for Optimal Cycling Safety by Gordie Johnson

This headlight is amazing! At low rpm it's a lot brighter than my previous headlight which was very good in COMPLETE darkness in the woods on the bike path. I think at the brightest setting you could use it to land a plane! The flash of daylight is bright enough to easily see its reflection from signs and markings far away in early evening light. The longest I've had in the light/flash was about three or three and a half hours and it was still going strong. These days I mostly drive with my flash on to make sure I'm seen. I haven't used it on Low Hard any longer but I have no doubt it will be great. As the season draws to a close and daylight hours get shorter, it will become stable in testing very soon. The mount is solid, but it twists on the handlebars on bumpy roads and has to be rolled back to face forward. Maybe a piece of old duct tape underneath would help. It takes about an hour or an hour and a half to charge after long-term use. I no longer use a wireless computer and it doesn't interfere with my old wired computer or the Wahoo Elemnt Bolt I use. Wireless bike computers tend to hang around LED lights, which is why I switched to a wired computer in the first place. I would recommend this light for all day/night use!