You're wondering if the Black Diamond Spot 400 headlamp is waterproof, right?

Well, according to the manufacturer, it's got an IPX8 rating. This means it can handle being submerged in up to a meter of water for about 30 minutes, which is pretty reassuring if you find yourself caught in the rain or needing to cross a stream.

As for other features, it's got this neat PowerTap Technology for quickly switching between brightness levels, which comes in handy whether you're on a dark trail or just around camp. Plus, the Brightness Memory feature remembers your last setting, so you don't have to readjust it every time you turn it back on. It's something a lot of folks appreciate for the convenience.

Our research found people generally like how versatile this headlamp is, though a few mentioned having to get used to all its settings at first.

Overall, it seems like a solid pick if you need a waterproof and feature-rich headlamp for various outdoor scenarios.

The Black Diamond Spot 400 headlamp is seriously bright, with 400 lumens to light up everything from trails to campsites. That's according to how the manufacturer describes it. Our research backs this up, highlighting how effective it is for outdoor activities like hiking and camping.

You can expect a nice, focused beam that's perfect for close-up work or lighting up a wider area. Just a heads up – if you keep it on the maximum brightness, the battery will drain faster, so plan accordingly.

One of the neat things about the Spot 400 is its flexibility. It's got different light modes, including dimming options, so you can dial down the brightness to save some battery power when you don't need all 400 lumens. This comes in handy for longer trips where conserving battery life is key.

It starts off with three AAA alkaline batteries, which are included in the box, so you can use it straight away. If you're looking for a greener option, it also works with the Black Diamond BD 1500 lithium-ion battery, which is rechargeable (though you'd need to buy that separately). This could save you some cash and be kinder to the environment if you're planning lots of adventures.

Overall, the Black Diamond Spot 400 is a versatile headlamp suitable for different situations and preferences. Whether you stick with the included batteries or opt for the rechargeable route, you’ll have plenty of light at your disposal.

So, about the Black Diamond Spot 400 headlamp's battery life—the deal is, you've got a couple of power options. You can go with standard AAA batteries, which is what the manufacturer suggests as a simple option.

But if you're not into changing batteries frequently, you can spring for a separate BD 1500 rechargeable battery pack.

Based on what the manufacturer says, the AAA batteries should last a good while, especially if you make use of the dimming and strobe modes. However, from what we gathered, some folks think the regular batteries are fine, while others prefer the rechargeable pack so they don't have to keep swapping them out.

One cool thing is the PowerTap Technology, which makes it easy to switch brightness levels. But a few people mentioned it's a bit touchy and can change settings accidentally, which might use up more battery if you're not paying attention.

As for the red night vision mode, opinions are mixed. It's great for keeping your night vision, but some have found it a bit too dim for very dark situations. If you're frequently using brighter settings, it might drain the battery quicker.

If battery life is your main concern, you've got a couple ways to manage it. For longer, more demanding use, getting the rechargeable BD 1500 might be worth it.

But if you're not using it extensively, having some spare AAA batteries probably works too.

In the end, while no battery lasts forever, the Black Diamond Spot 400 gives you flexibility to suit what you need, whether that's convenience or longer-lasting power. From what we've seen, it generally performs well, and its power management features can help you make it last longer.