Black Diamond
Black Diamond Cosmo DFR (350 lumens)
- Brightness: 5/10 How much light it gives at full power, for finding your way in the dark.
- Runtime: 8/10 How long one charge or set of batteries lasts at a level you can walk and cook by.
- Weight: 7/10 How much it adds to your pack and your head.
Camp use, evening walks and overnighters where a simple lamp with a red light is wanted
- Brightness
- 350 lumens (maker's figure)
- Runtime
- 9.4 h at 175 lumens
- Weight
- 70 g
- Power
- Both
- Water rating
- IPX4
Where to buy
Alpinetrek £40.85 In stock. Delivery £4.49. Black shown. Price includes duties and taxes. Free delivery from £85, £4.49 under that. Delivery time 5 to 7 working days.
View at shop: AlpinetrekUltralight Outdoor Gear £44.99 In stock. Free delivery. Shop's list price £49.99. Says the BD 1500 pack is included, 82 g with batteries and IPX7. Free tracked UK delivery.
View at shop: Ultralight Outdoor GearBlack Diamond (UK store) £50 In stock. Delivery £10. Black Diamond's own UK store and UK list price. Free delivery over £150; no import duty; about 5 working days. Black and Desert Sky in stock. The page also says 'Out of Stock', but 'Add to bag' is shown.
View at shop: Black Diamond (UK store)Prices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Brightness
From maker's figures 5/10How much light it gives at full power, for finding your way in the dark. 5: Does the job. Average for wild-camping gear.
Maker's figure, 350 lumens with no test standard stated on Black Diamond's DFR page: the 300–499 band (maker's figure). The Cosmo's instruction sheet heads its table ANSI FL-1, but it covers the Cosmo, not the DFR.
Runtime
From maker's figures 8/10How long one charge or set of batteries lasts at a level you can walk and cook by. 8: Clearly better than most.
Black Diamond's DFR page gives no burn times. The instruction sheet of the Cosmo 350 (the same 350-lumen lamp, with the same two-battery system) gives 175 lumens as 9.4 hours on the BD 1500 pack that the DFR comes with and 6 hours on AAA: both in the 6–9.9 h band. The 350-lumen mode lasts 5 hours on the pack and 3.2 hours on AAA. Ultralight Outdoor Gear's DFR page shows the same 3.2 h and 120 h figures as the sheet's AAA column.
Weight
From maker's figures 7/10How much it adds to your pack and your head. 7: Better than most.
Black Diamond's page lists 70 g and Ultralight Outdoor Gear lists 82 g with batteries: both in the 50–89 g band.
In short
Good for
- Camp use, evening walks and overnighters where a simple lamp with a red light is wanted
- Hikers who want a rechargeable pack in the box and AAA as a back-up
- Camp use, evening walks and damp-weather overnighters (stormproof, IPX4)
Strengths
- 350 lumens (maker's figure) with adjustable brightness, red light and strobe
- BD 1500 Li-ion pack included (charges in the lamp over USB-C), and the lamp also runs on three AAA
- 175 lumens lasts 9.4 hours on the BD 1500 pack (Cosmo 350 sheet)
- Two-button control, mode memory, battery meter and digital lock
- 3-year Black Diamond warranty
Weaknesses
- New for 2026 with no independent review, so comfort and beam are estimates, not reviewed scores
- Black Diamond's pages disagree on the water rating: IPX4 on the DFR page, IPX7 on the Cosmo 350 sheet and at a UK shop. We show the lower, IPX4
- Black Diamond's DFR page says the pack is included in one place and sold separately in another; Ultralight Outdoor Gear, Alpinetrek and the product photo show it included
- Short at full power: 5 hours at 350 lumens on the pack, 3.2 hours on AAA
- The lamp's weight isn't clear: 70 g on Black Diamond's page, 82 g at a UK shop
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.