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Black Diamond
Onsight 375 Headlamp

4.46969696969697 out of 5 stars
66 Reviews
$47.96 - $59.95
Up to 20% off



Why We Like The Onsight 375 Headlamp

When we go climbing we don't stop when the sun goes down, instead we reach for the Onsight 375 Headlamp. This headlamp boasts a low profile and a dual-beam configuration that lets you scale walls and solve problems after dark.


  • Versatile headlamp built specifically for climbing after hours
  • 375 lumens on max setting ensures you can light up the crag
  • Climbing and Route-finding modes optimize your beam style
  • Perforated elastic headband offers reliable comfort and performance
  • Dual-fuel lets you pick between AAA or rechargeable batteries
  • Water and dust proof ratings lets you climb through bad weather
  • Digital lockout feature prevents unwanted battery drain in pack
  • Item #BLDZ9DF
Power Source
Lithium Ion BD 1800, Alkaline cells
Batteries Included
climbing, route-finding
perforated, elastic
Manufacturer Warranty
3 years

Overall Rating

4.5 based on 66 ratings

Review Summary

1 Stars - 3 reviews
2 Stars - 1 reviews
3 Stars - 2 reviews
4 Stars - 16 reviews
5 Stars - 44 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

April 8, 2024

Feel the Quality

"I recently purchased this headlamp and I must say, it exceeded my expectations in every way. The build quality is top-notch, and it feels very durable. The straps are adjustable and comfortable to wear for extended periods. The brightness and beam distance are impressive, making it perfect for outdoor activities like hiking or camping. Overall, I highly recommend this headlamp for anyone looking for a reliable, high-quality light source."

otari k.

Originally reviewed on

1 out of 5 stars

March 5, 2024

Why so complicated.

I've used it once or twice and have initial impressions

I just want a rechargeable headlamp that can also take regular batteries for convenience/emergencies/offgrid. I also like having battery back in back for comfort. So this gets pretty close but ultimately just frustrating. Rechargeable battery does not come with it; i bought the separate battery but it does not fit; it does say 1800 which was out of stock, but I got a 1500 but for some stupid stupid reason there is a battery contour strip which makes the 1500 not fit. Additionally, there is no charging port on the rechargeable battery; apparently I would need an external charger. Only sport this is excelled in was an exercise in frustration. One thing I DON'T love dealing with: half of my gear list being the friggin headlamp components. Get it together, BD.

Jeannette C
5 out of 5 stars

March 5, 2024

I always use Blackdiamond headlamps

I always use Blackdiamond headlamps and I think they are the best I have used them for years

Seyed H.

Originally reviewed on

5 out of 5 stars

February 24, 2024

Great light that dims

Glad to have a headlamp with a dimmer. I've noticed that the batteries have lasted longer and I expect it's due to the dimmer functionality. I enjoy the flood light capability on my morning walks too

Cody M.

Originally reviewed on

5 out of 5 stars

February 17, 2024

Great light!

Fits great on the captain and the half dome helmets. Easy to use, top button turns it and and 2 finger side tap to change settings. I'm not sure just how long the battery lasts but It last all through the night at least. It comes with triple a batteries but also can take the bd rechargeable pack. That's a good feature for the SAR missions I bought it to use on because you can't always charge it but you can always carry more batteries. It you are considering it, get it.

Tim E.

Originally reviewed on

4 out of 5 stars

January 23, 2024

Missing one feature

This is one of the few BD head lamps without the red light. This missing feature takes away one star from this review. Otherwise, a really nice light.

Guy C.

Originally reviewed on

5 out of 5 stars

January 19, 2024




Originally reviewed on

1 out of 5 stars

January 7, 2024

Only one bulb works

I’ll be bringing my purchase back bcs only half the lamp works.

Richard I.

Originally reviewed on

5 out of 5 stars

December 15, 2023

This torch is perfect for

This torch is perfect for camping, climbing and fishing. I have a bad habit of getting headlamps too wet, and I love that this is waterproof! Great light and lightweight for the price

Blake O.

Originally reviewed on

5 out of 5 stars

December 12, 2023

Black Diamond rocks!

These lights are amongst the best and every bit as good or better than the competition.

Tony N.

Originally reviewed on