Black Diamond Astro 300 Headlamp vs Fenix HL18R-T

Weight and specs compared for 2026 — and which one to choose.

Fenix HL18R-T is the lighter option — 3 g lighter than the Black Diamond Astro 300 Headlamp (7% less weight). If grams matter to you, that is the one to beat.

Spec	Black Diamond Astro 300 Headlamp	Fenix HL18R-T
Weight	45 g · 0.045 kg · 0.10 lb	42 g · 0.042 kg · 0.09 lb
Brand	Black Diamond	Fenix
Category	Lighting	Lighting

Black Diamond Astro 300 Headlamp

45 g

Ultralight 300-lumen headlamp at only 45g. Compact waterproof design with single AAA battery; perfect for thru-hikers minimizing base weight.

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Fenix HL18R-T

42 g

Ultralight 500-lumen rechargeable headlamp for trail running.

Full details →

Black Diamond Astro 300 Headlamp vs Fenix HL18R-T: which should you buy?

If saving weight is your priority, the Fenix HL18R-T wins — at 42 g it is 3 g (7%) lighter than the Black Diamond Astro 300 Headlamp (45 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest lighting page, or browse the full gear weight database.

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