Olight Arkfeld Ultra vs Sofirn SC31 Pro size comparison
The Sofirn SC31 Pro is 2.5 mm (0.10 in) shorter than the Olight Arkfeld Ultra, and 1.6 mm narrower at its widest point. Weights are published on different bases (without battery vs with battery), so compare them with care.
The Sofirn SC31 Pro is 2.5 mm (0.10 in) shorter than the Olight Arkfeld Ultra, and 1.6 mm narrower at its widest point. Weights are published on different bases (without battery vs with battery), so compare them with care.
Dimensions
| Olight Arkfeld Ultra Check price ↗ | Sofirn SC31 Pro Check price ↗ | |
| Length | 120 mm (4.72 in) | 117.5 mm (4.63 in)−2.5 mm |
| Head / width | 27 mm (1.06 in) | 25.4 mm (1.00 in)−1.6 mm |
| Thickness | 16 mm (0.63 in) | — |
| Weight | 119 g with battery | 59 g without battery |
| Battery | Built-in | 18650 |
| Max output | — | 2,000 lm |
| Throw | 103 m | — |
| Type | EDC | EDC |
| Price | $119.99 at olight.com, as of Nov 4, 2026 | not verified yet |
| Source | olight.com sourced Max output not shown in spec block | sofirnlight.com sourced Only head diameter listed |
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Arkfeld Ultra vs SC31 Pro: how they differ
Size and weight
The Sofirn SC31 Pro is the shorter light: 117.5 mm (4.63 in) against 120 mm (4.72 in), a difference of 2.5 mm (2%). At its widest point the Sofirn SC31 Pro is 1.6 mm slimmer (25.4 vs 27 mm). Weights are published on different bases (Olight Arkfeld Ultra: 119 g with battery; Sofirn SC31 Pro: 59 g without battery), so they are not directly comparable.
Brightness and throw
The Sofirn SC31 Pro is rated at 2,000 lm; we have no published maximum for the Olight Arkfeld Ultra.
Battery
The Olight Arkfeld Ultra runs on a built-in rechargeable battery; the Sofirn SC31 Pro runs on a removable 18650 battery. Only the Sofirn SC31 Pro lets you swap in a charged spare.
Type
Both are EDC lights in our catalog.
Which should you buy?
Choose the Olight Arkfeld Ultra if you want a built-in battery with no separate cell to buy. Choose the Sofirn SC31 Pro if you want a slimmer profile (1.6 mm narrower) and a removable cell you can swap. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Olight Arkfeld Ultra Check price ↗ Sofirn SC31 Pro
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Arkfeld Ultra vs SC31 Pro FAQ
Which is smaller, the Olight Arkfeld Ultra or the Sofirn SC31 Pro?
The Sofirn SC31 Pro is the shorter light: 117.5 mm (4.63 in) against 120 mm (4.72 in), a difference of 2.5 mm (2%). At its widest point the Sofirn SC31 Pro is 1.6 mm slimmer (25.4 vs 27 mm). Weights are published on different bases (Olight Arkfeld Ultra: 119 g with battery; Sofirn SC31 Pro: 59 g without battery), so they are not directly comparable.
Do the Olight Arkfeld Ultra and Sofirn SC31 Pro use the same battery?
The Olight Arkfeld Ultra runs on a built-in rechargeable battery; the Sofirn SC31 Pro runs on a removable 18650 battery. Only the Sofirn SC31 Pro lets you swap in a charged spare.
Compare Olight Arkfeld Ultra with similar lights
Compare Sofirn SC31 Pro with similar lights
More
Sources
- Olight Arkfeld Ultra: specs from Olight product page (manufacturer). Price $119.99 from olight.com, checked Nov 4, 2026; prices change often.
- Sofirn SC31 Pro: specs from manufacturer published specs as listed by sofirnlight.com. No verified price yet.
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