The Intensity Headtorch from Ordnance Survey comes with various light modes including an SOS flash and can be switched to red for night navigation.
155 lumens brightness17-62 metre adjustable beamCREE XPG3 S2 white LED and 2 x 5mm Red LED7 lighting modes - including SOS flashWater and impact resistant main bodyAdjustable head strapOperates on 1 x AA battery (included)Battery life: up to 35 hours