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Black Diamond Cosmo 350 Headlamp
$39.95
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Around the house, on the trail or at the campsite, the compact, watertight Black Diamond Cosmo 350 headlamp provides an all-purpose, 350-lumen beam and a red light function to light up the night.
- Dual-fuel design allows you to power the headlamp with 3 AAA alkaline batteries (included) or the rechargeable BD 1500 lithium-ion battery and charger (not included)
- Settings include dimming, strobe, red night-vision and lock mode
- White LED emits up to 350 lumens on max setting, 175 lumens on medium and 6 lumens on low
- Red LED night vision has dimming and strobe modes, and is quickly activated with the dual-button interface
- Multifaceted optical lens design
- Integrated battery meter display shows the percentage of power remaining so you know when to replace the batteries
- Digital lockout feature prevents accidental use when stored in a pack or pocket as a backup
- IPX8 waterproof protection rated to operate at least 1.1 meters underwater for 30 minutes—perfect should you be caught in a downpour
- If headlamp is submerged, water may enter the battery compartment, but it will still operate; it should be completely dried out after use in wet conditions
Imported.
View the Black Diamond Cosmo Product LineView all Black Diamond LED Headlamps| Best Use | Camping Backpacking |
|---|---|
| Bulb Type | LED |
| Bulb Detail | 1 white / 1 red |
| Red Light Mode | Yes |
| Beam Type | Spot |
| Max Light Output (Lumens) | 350 lumens |
| Light Output | High: 350; medium: 175; low: 6 lumens |
| Max Beam Distance (m) | 64 meters |
| Beam Distance | High: 64; medium: 45; low: 10 meters |
| Brightness Levels | Variable |
| Strobes | 3 |
| Average Run Time | High: 3; medium: 6; low: 200 hours |
| Rechargeability | Non-rechargeable |
| Batteries | 3 AAA alkaline (included); also compatible with BD 1500 mAh rechargeable (not included) |
| Dimensions | 5 x 4 x 2 inches |
| Water-Resistance Rating | IPX8 |
| Weight With Batteries | 2.8 ounces |
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Most Helpful Favorable Review
Extremely bright little camp light
Cyclingmasterseller2 years ago
I highly recommend this little bright light for camp and hiking, climbing, whatever you do where dependable light is needed. At 350 lumens the light output for the size is like an ant using a human flashlight to see something. It is built very well, however, I recommend using a thin film of vasoline on the battery-closure area to seal out the water from it; because even though this light is rated to be submergible in water without damage, they mean to the light area, not the battery compartment -- keep this in mind. Buy this light, you will love it!
Cyclingmasterseller
Columbus, Ohio
10 people found this review helpful
Most Helpful Critical Review
Sad it didn't last
Oritt2 years ago
It worked great until it didn't...I thought the batteries had died so tried a new set and nothing. This was probably a year after I bought it. Worth mentioning that I take out the batteries in between uses to try and prevent battery corrosion..
Oritt
New York, NY
13 people found this review helpful
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CFOSP1
Received free product
St. Paul, MN
A powerful headlamp in a lightweight package
3 years ago
The first thing I noticed when I received the Cosmo 350 was the compact packaging with very little plastic. Easy to open and easy to recycle! Another nice touch: the headlamp came with three AAA batteries. On my kitchen scale, it comes in at 80g, it would be 75g if using the optional BD1500 rechargeable battery I’m impressed with the headlamp’s usability. The light has two buttons, one larger on/off switch, controlling also brightness and steady/flash modes, and one smaller, to toggle between white and red light. Both the white and red lights are dimmable and both can be used in flash mode. Compared to some other headlamps I have used, the controls are very intuitive. Clicking once turns the light on or off, clicking twice switches from steady to flash and simply holding the large button adjusts brightness. An added feature is that the last setting used persists when the Cosmo 350 is turned off and on again. As someone who cross country skis early mornings and late nights, I was a little worried that it would be hard to operate the buttons while wearing heavy winter gloves. I tested this and the buttons were easy to push wearing gloves. The Cosmo 350 is comfortable to wear, the wide headband is easy to adjust. I prefer having a third band going over the top of my head while running with a headlamp, but the light weight of the Cosmo makes this likely unnecessary. Dabbling a bit in stargazing and astrophotography, I really appreciate the brightness-adjustable red light to preserve night vision while adjusting camera settings. I was curious how long a charge of Black Diamond’s BD1500 would last. After I topped off the battery in the provided charger, I inserted it and turned on the light on its highest brightness setting at 8 AM. At noon, the light was still bright. Leaving the headlamp on my desk, I forgot about it until around 9 PM. To my surprise, the light, while not as bright, was still on when I checked. One note: when I started this test, I initially carried the light in my pocket and noticed that it got rather warm. After I took it out, the heat dissipated quickly. It may be a good idea to make sure that the Cosmo 350 is off before stashing it away. By the way, there is a locking feature available to avoid accidentally turning on the light while packed away: holding down both buttons at the same time. One thing I’m a bit concerned about is is the tab that holds the battery cover in place. I’m a bit worried about material fatigue of these tabs and about changing batteries in very cold conditions, when plastic tends to get brittle. Another concern is the IPX8 rating. Technically, I should not have to worry about the Cosmo 350 falling in the water as long as it’s fished out quickly. Looking closely at the light, the battery compartment does not look like it’s IPX8. That may be OK in freshwater, but definitely not in saltwater. Yes, there are much more powerful headlamps available, and I do have a couple. But I'd say that the Cosmo 350 covers at least 90% of my night time activities, which include night orienteering, hiking, camping, fishing and astophotography. All in all, the Black Diamond Cosmo 350 is a great lightweight headlamp putting a lot of features and a respectable battery life in a small and inexpensive package. In spite of the concerns I noted, I am giving five stars because of the low price of the headlamp.
Age:55–64
Yes , I recommend this product
Peter
Received free product
Chicago, IL
Handy headlamp
3 years ago
This headlamp is small, bright, and packs quite a few features into its tiny frame. 1. The headlamp has a comfortable strap which is easily adjusted for fit. The strap can also expand a considerable distance so you can wrap it around a backpack and use it for walking or biking. The headlamp itself can also be adjusted up or down. This is extremely useful in finding the perfect position for the light. And it holds strong! There is no worry about the light moving once you adjust its position. 2. It comes with three AAA batteries which can provide over 200 hours of illumination, depending on the brightness used. The headlamp also has a built-in battery indicator which you can see when you turn the headlamp off. The small red light will blink to indicate the estimated remaining battery life. For example, blinking 3 times tells you the batteries are still at or above 75% of their original charge. It’s a handy feature, but one that’s easy to overlook. 3. The two buttons on top of the headlamp make it easy to change and adjust settings. For example, one push of the large button turns it on/off, one push of the small button switches from white to red light, two pushes of the large button goes to strobe mode, holding the large button adjust the brightness along a gradient (i.e. no hard settings, you can dim or brighten to your need), and holding both buttons locks the setting in place. A downside to the buttons is some of them have multiple controls. For example, the headlamp is turned on/off with the large button, but that’s also how you check the battery life. While I haven’t been able to use this on a camping trip yet, I have found plenty of uses for it around the home: taking my dog on a late night walk, riding my bike early in the morning or late at night, cleaning my car in my dimly lit garage, and working in the the basement. I even used it to read in a dark room to mimic reading in the tent before bed. And it’s awesome! It’s been incredibly handy! So overall 4 stars for its fit, battery life, brightness, and versatility. I’d give it five stars if the button options were more intuitive and didn’t have multiple options for the same action. But with time, I’ll figure it all out and it will become second nature.
Age:35–44
Yes , I recommend this product
Phil
Definitely NOT waterproof.
1 year ago
I bought this expressly because it was supposed to be more waterproof than cheaper versions. An REI expert recommended this specific lamp because of that. I can physically see the contacts for the batteries through gaps in the case, in addition to the gap where water can easily enter the battery compartment. This means that this headlamp will not work in the rain, or if it is rained on, because the batteries will all be dead from water shorting them out. Every other function is perfect, save for the flashing red light indicating battery level every time you turn off the lamp. I don't want flashing lights unless I prompt this.
Naturdoc
Received free product
very bright, dimmable light. Waterproof!
3 years ago
This headlamp is comfortable to wear, very lightweight, easy to use and incredibly bright. Comparable to previous headlamp I have, i'd say it's twice as bright. Since it is water resistant and can be submerged, I feel comfortable taking it on my kayak trips.
Age:45–54
Yes , I recommend this product
dad4monkeys
Received free product
Mesa, AZ
Lightweight & Easy to Use
3 years ago
Good headlamp. Had a chance to use it for a few things - car camping, riding around the neighborhood at night on the onewheel, and night hikes. Good combination of weight (comfort) and battery length. At 350 lumens it is bright enough to light the place up including enough to see the variations in the road for the onewheel (very helpful). This is the first headlamp I've pulled off the headband and put on the chest strap on my pack (see photo). Most of my other lights have been too big and would point straight down (useless) and bounce too much. This is light enough for that to work (still points at an angle just not vertical). In AZ that is big because night hiking is helpful for 4-5 months of the year. Like the dimmer control concept instead of clicking through bright, medium, low. You just hold it and it cycles through. Battery length is good, but admittedly haven't done anything longer than a couple of hours (with rechargeable battery). You have the ability to check battery life when you shut it down (red light clicks between 1-3 times to let you know how much juice left which is nice). Only knock is that the battery has to be charged in its own separate charger - have a Petzel that can plug straight into the USB. Perhaps that is the trade for the low weight, but the other pros are worth the separate charger.
Age:45–54
Yes , I recommend this product
JoeC
Received free product
Houston, TX
Very reliable light source
3 years ago
This is a great headlamp for camping and household use. It's very light and comfortable to wear. Adjusting the headband size and light projection angle was easy. The LED is bright enough to get around the campsite. Switching between normal to red LEDs was simple and made this headlamp great for night photography when you need a light source to handle your equipment without compromising your night vision in between shots. Locking the headlamp into storage mode (so unintentional button presses while inside your backpack won't turn on the lamp inadertently) was easy to accomplish.
Age:35–44
Yes , I recommend this product
Cyclingmasterseller
Columbus, Ohio
Extremely bright little camp light
2 years ago
I highly recommend this little bright light for camp and hiking, climbing, whatever you do where dependable light is needed. At 350 lumens the light output for the size is like an ant using a human flashlight to see something. It is built very well, however, I recommend using a thin film of vasoline on the battery-closure area to seal out the water from it; because even though this light is rated to be submergible in water without damage, they mean to the light area, not the battery compartment -- keep this in mind. Buy this light, you will love it!
Age:65–74
Yes , I recommend this product
tryantofly
San Diego, CA
Great improvement from previous model Cosmo 300
2 years ago
I owned a previous generation Cosmo 300 from Mar 2022 - Dec 2022 (just under a year) before it started having intermittent battery contact issues so I replaced it with this Cosmo 350. Overall the best features of the improved design include: 1. More robust battery terminal design and awesome to choose between AAA or the rechargeable battery pack. 2. Totally silent operation - no more loud CLICKing to adjust the tilt angle of the headlamp. 3. Awesome light output, battery life, and optics. Easy to operate. 4. The lens is a great balance between narrow spot beam and wide scene lighting. This is my favorite headlamp now for running, camping, hiking, exploring, vehicle maintenance, and every day use.
Age:25–34
Yes , I recommend this product
Oritt
New York, NY
Sad it didn't last
2 years ago
It worked great until it didn't...I thought the batteries had died so tried a new set and nothing. This was probably a year after I bought it. Worth mentioning that I take out the batteries in between uses to try and prevent battery corrosion..
Age:25–34
CancelDST4good
Dahlonega, GA
Not suitable for night hiking
8 months ago
Fine for casual use, but not great for night hiking, trail running, etc. Just doesn't output enough light to move confidently even at brisk walking pace. Brightness is changed by holding the button and timing your release when you're happy with the light output. Would be better if it had discrete light outputs to toggle between. I have a niterider Lumina 750 that outputs wayyy more light at its lowest setting (supposedly 200 lumens). This BD Cosmo 350 at max setting can't compare.
Age:25–34
No, I do not recommend this product
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