Olight ArkPro Ultra vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 6.6 mm (0.26 in) longer than the Olight ArkPro Ultra, with about the same max diameter/width. It is 5 g heavier (with battery).
Olight ArkPro Ultra: Photo: Olight · Image policy
The Streamlight ProTac 2L-X USB is 6.6 mm (0.26 in) longer than the Olight ArkPro Ultra, with about the same max diameter/width. It is 5 g heavier (with battery).
Dimensions
| Olight ArkPro Ultra Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 124 mm (4.88 in) | 130.6 mm (5.14 in)+6.6 mm |
| Head / width | 27 mm (1.06 in) | 26.9 mm (1.06 in)−0.1 mm |
| Body | — | 23.9 mm (0.94 in) |
| Thickness | 16 mm (0.63 in) | — |
| Weight | 120 g with battery | 125 g with battery+5 g |
| Battery | Built-in | 18650 / 2x CR123A |
| Max output | 1,700 lm | 500 lm |
| Throw | 205 m | — |
| Type | EDC | EDC |
| Price | $129.99 at olight.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | olight.com sourced | batteryjunction.com sourced |
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ArkPro Ultra vs ProTac 2L-X USB: how they differ
Size and weight
The Olight ArkPro Ultra is the shorter light: 124 mm (4.88 in) against 130.6 mm (5.14 in), a difference of 6.6 mm (5%). At their widest points they are about the same (27 vs 26.9 mm). The Olight ArkPro Ultra is 5 g lighter (120 g vs 125 g, with battery).
Brightness and throw
The Olight ArkPro Ultra is rated brighter: 1,700 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 240% more.
Battery
The Olight ArkPro Ultra runs on a built-in rechargeable battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. Only the Streamlight ProTac 2L-X USB lets you swap in a charged spare.
Price
When we checked on Nov 4, 2026, the Olight ArkPro Ultra was $129.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $46.94 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog.
Which should you buy?
Choose the Olight ArkPro Ultra if you want a shorter light (6.6 mm shorter), more output (1,700 lm vs 500 lm) and a built-in battery with no separate cell to buy. Choose the Streamlight ProTac 2L-X USB if you want 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 ↗ Streamlight ProTac 2L-X USB
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ArkPro Ultra vs ProTac 2L-X USB FAQ
Which is smaller, the Olight ArkPro Ultra or the Streamlight ProTac 2L-X USB?
The Olight ArkPro Ultra is the shorter light: 124 mm (4.88 in) against 130.6 mm (5.14 in), a difference of 6.6 mm (5%). At their widest points they are about the same (27 vs 26.9 mm). The Olight ArkPro Ultra is 5 g lighter (120 g vs 125 g, with battery).
Which is brighter, the Olight ArkPro Ultra or the Streamlight ProTac 2L-X USB?
The Olight ArkPro Ultra is rated brighter: 1,700 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 240% more.
Which is cheaper, the Olight ArkPro Ultra or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Olight ArkPro Ultra was $129.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $46.94 less. Prices change often, so check the current price before you buy.
Do the Olight ArkPro Ultra and Streamlight ProTac 2L-X USB use the same battery?
The Olight ArkPro Ultra runs on a built-in rechargeable battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. Only the Streamlight ProTac 2L-X USB lets you swap in a charged spare.
Compare Olight ArkPro Ultra with similar lights
Compare Streamlight ProTac 2L-X USB 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.
- Streamlight ProTac 2L-X USB: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $83.05 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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