The Black Diamond Storm is a robust and full-featured headlamp that offers a bright and wide beam, a fully waterproof enclosure, and excellent optics for both close proximity flood and long-distance spot lighting. It is our testers favorite Black Diamond headlamp, winner of our Editors' Choice award, and a headlamp we would readily recommend to friend. It uses 4 AAA alkaline batteries, but it will readily accept rechargeables and we found lighting performance was even better using the well regarded Panasonic Eneloop AAA NiMH batteries.
The Storm is rated IPX67, which means it is both waterproof to 1-meter submersion for 30 minutes, and dustproof. Stargazers and hunters will appreciate three excellent color LED lights: red, green, and blue. The Storm weighs in at a reasonable 4.0 ounces (112g), placing it just a bit higher than average, owing to its 4 AAA batteries (most use only 3). But, that extra battery pays dividends in terms of better battery life, with the Storm offering 5 hours in high mode and 42 hours in low, dramatically better than the $10 lower cost Black Diamond Spot. The four AAA battery configuration also simplfiies use with rechargeables, since many chargers require an even number of batteries.
The bottom line is that if you decide to buy the Storm, know that it is a choice we recommend and that you will not regret; we think it is well worth the higher price over strong alternatives like the $20 list Petzl Tikkina or the $40 list BD Spot.