Olight ArkPro Ultra vs Sofirn SC31 Pro size comparison
The Sofirn SC31 Pro is 6.5 mm (0.26 in) shorter than the Olight ArkPro 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.
Olight ArkPro Ultra: Photo: Olight · Image policy
The Sofirn SC31 Pro is 6.5 mm (0.26 in) shorter than the Olight ArkPro 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 ArkPro Ultra Check price ↗ | Sofirn SC31 Pro Check price ↗ | |
| Length | 124 mm (4.88 in) | 117.5 mm (4.63 in)−6.5 mm |
| Head / width | 27 mm (1.06 in) | 25.4 mm (1.00 in)−1.6 mm |
| Thickness | 16 mm (0.63 in) | — |
| Weight | 120 g with battery | 59 g without battery |
| Battery | Built-in | 18650 |
| Max output | 1,700 lm | 2,000 lm |
| Throw | 205 m | — |
| Type | EDC | EDC |
| Price | $129.99 at olight.com, as of Nov 4, 2026 | not verified yet |
| Source | olight.com sourced | sofirnlight.com sourced Only head diameter listed |
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ArkPro 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 124 mm (4.88 in), a difference of 6.5 mm (5%). 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 ArkPro Ultra: 120 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 brighter: 2,000 lm maximum vs 1,700 lm for the Olight ArkPro Ultra, 18% more.
Battery
The Olight ArkPro 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 ArkPro Ultra if you want a built-in battery with no separate cell to buy. Choose the Sofirn SC31 Pro if you want a shorter light (6.5 mm shorter), a slimmer profile (1.6 mm narrower), more output (2,000 lm vs 1,700 lm) 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 ArkPro Ultra Check price ↗ Sofirn SC31 Pro
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ArkPro Ultra vs SC31 Pro FAQ
Which is smaller, the Olight ArkPro Ultra or the Sofirn SC31 Pro?
The Sofirn SC31 Pro is the shorter light: 117.5 mm (4.63 in) against 124 mm (4.88 in), a difference of 6.5 mm (5%). 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 ArkPro Ultra: 120 g with battery; Sofirn SC31 Pro: 59 g without battery), so they are not directly comparable.
Which is brighter, the Olight ArkPro Ultra or the Sofirn SC31 Pro?
The Sofirn SC31 Pro is rated brighter: 2,000 lm maximum vs 1,700 lm for the Olight ArkPro Ultra, 18% more.
Do the Olight ArkPro Ultra and Sofirn SC31 Pro use the same battery?
The Olight ArkPro 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 ArkPro Ultra with similar lights
Compare Sofirn SC31 Pro with similar lights
More
Sources
- Olight ArkPro Ultra: specs from Olight product page (manufacturer). Photo from manufacturer: the maker's own product photo with the background removed, scaled to the published length and diameter (Photo: Olight; image policy). Price $129.99 from olight.com, checked Nov 4, 2026; prices change often.
- Sofirn SC31 Pro: specs from manufacturer published specs as listed by sofirnlight.com. Drawing: outline from published specs. No verified price yet.
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