Beam Comparison - Headlamp


Battery Life vs. Beam Distance - the above graph shows how beam distance at the brightest setting degrades as battery life runs down. We use the ANSI FL-1 battery run-time spec, which says run-time for the high mode is finished when brightness degrades 90% from its initial value. The ANSI standard is more stringent than what headlamp manufacturers use. They consider high mode run-time still OK so long as there's enough battery to produce light as bright as a candle placed 2 meters away (0.25 lux). We think the manufacturer's approach is deceptive and misleads consumers to believe the high output mode produces a long-distance beam much longer than it actually does.

                                       : we measured the maximum beam distance as 128 meters and the ANSI battery run time for the high setting as 3.3 hours.
                                       : we measured the maximum beam distance as 80 meters and the ANSI battery run time for the high setting as 8.2 hours.

Side-by-Side Comparison


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Pros Lightweight, small size, excellent flood beam, great priceLightweight, small size, excellent flood lighting
Cons Too weak a beam for trail finding or distance viewingBelow average spot beam, disappointing low-mode battery life
Bottom Line Offers great close proximity lighting at a budget priceA good light, but caught in a no-mans land between better lights and cheaper lights
Weighted Metrics Black Diamond Astro Black Diamond Cosmo
Trail Finding - 35%
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Close Proximity - 20%
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Battery Life - 15%
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Weight - 15%
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Ease Of Use - 15%
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Product Specs Black Diamond Astro Black Diamond Cosmo
Measured Beam Distance 38 m 66 m
Claimed Distance 35 m 65 m
Measured High Mode Run-time (ANSI) 4.8 hrs 3.9 hrs
Claimed High Mode Run-time 20 hrs 45 hrs
Measured Low Mode Run-time 95 hrs 39 hrs
Claimed Low Mode Run-time 80 hrs 180 hrs
Measured Weight 3 oz, 86 g 3 oz, 86 g
Battery Type 3 AAA 3 AAA
Water Resistance IPX4 splash proof IPX8 waterproof beyond one meter
Manuf Claimed Lumens 150 lumens 200 lumens
Beam Type flood, dimmable flood/spot, dimmable
Red Light no yes
On Switch Lock yes yes