We're working out what we think - we'll add our view here!
Black Diamond says:
Built to support any adventure, the Flare is an emergency headlamp that’s lightweight and compact, while remaining extremely robust. Featuring 40 lumens of dependable light that runs off two Lithium CR2032 batteries housed in a burly aluminum housing, the Flare stows easily in a chalk bag zip pocket, a glove box, or emergency kit and can be deployed in any weather thanks to its IP67 submersible waterproof construction. The low-profile headband keeps the Flare minimal yet secure when worn. In addition to its low and full-strength white modes, the Flare includes red, strobe, and SOS modes to complete the Flare’s undisputed status as the ultimate emergency light at the ready for any mission.
*Reserve: Additional time the lamp will produce usable light for low intensity (measured to .25 Lux @ 4 meters)