Currently, the Icon 700 is Black Diamond's brightest headlamp. It emits up to 700 lumens and runs on 4 AA batteries. Run times range from 7 hours on high to 190 hours on low. The Icon 700 has an IPX 67 waterproof rating, which means that it can be submerged up to 1 meter for up to 30 minutes. , If you are looking for the brightest Black Diamond headlamp, the Black Diamond Sport 400-R or Storm 400 are great options. A headlamp with 350+ should offer ample coverage. , Black Diamond has a selection of headlamps that range in brightness and price. Their very brightest one is the Icon 700 headlamp, which has a light of 700 lumens.