BioLite HeadLamp 400 vs Fenix HL18R-T

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

Fenix HL18R-T is the lighter option — 33 g lighter than the BioLite HeadLamp 400 (44% less weight). If grams matter to you, that is the one to beat.

Spec	BioLite HeadLamp 400	Fenix HL18R-T
Weight	75 g · 0.075 kg · 0.17 lb	42 g · 0.042 kg · 0.09 lb
Brand	BioLite	Fenix
Category	Lighting	Lighting

BioLite HeadLamp 400

75 g

Rechargeable headlamp at 2.6 oz / 75g with 400 lumens maximum output and a moisture-wicking fabric strap. Front-facing tilt, USB-C charging, and weather resista...

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Fenix HL18R-T

42 g

Ultralight 500-lumen rechargeable headlamp for trail running.

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BioLite HeadLamp 400 vs Fenix HL18R-T: which should you buy?

If saving weight is your priority, the Fenix HL18R-T wins — at 42 g it is 33 g (44%) lighter than the BioLite HeadLamp 400 (75 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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