Olight ArkTac vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 4.9 mm (0.19 in) shorter than the Olight ArkTac, and 2.1 mm narrower at its widest point. It is 11 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 4.9 mm (0.19 in) shorter than the Olight ArkTac, and 2.1 mm narrower at its widest point. It is 11 g lighter (with battery).
Dimensions
| Olight ArkTac Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 135.5 mm (5.33 in) | 130.6 mm (5.14 in)−4.9 mm |
| Head / width | 29 mm (1.14 in) | 26.9 mm (1.06 in)−2.1 mm |
| Body | — | 23.9 mm (0.94 in) |
| Thickness | 17 mm (0.67 in) | — |
| Weight | 136 g with battery | 125 g with battery−11 g |
| Battery | Built-in | 18650 / 2x CR123A |
| Max output | 1,700 lm | 500 lm |
| Throw | 205 m | — |
| Type | EDC | EDC |
| Price | $119.99 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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ArkTac vs ProTac 2L-X USB: how they differ
Size and weight
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 135.5 mm (5.33 in), a difference of 4.9 mm (4%). At its widest point the Streamlight ProTac 2L-X USB is 2.1 mm slimmer (26.9 vs 29 mm). The Streamlight ProTac 2L-X USB is 11 g lighter (125 g vs 136 g, with battery).
Brightness and throw
The Olight ArkTac is rated brighter: 1,700 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 240% more.
Battery
The Olight ArkTac 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 ArkTac was $119.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $36.94 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 ArkTac if you want 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 shorter light (4.9 mm shorter), a slimmer profile (2.1 mm narrower), less weight (11 g lighter) 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 ArkTac Check price ↗ Streamlight ProTac 2L-X USB
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
ArkTac vs ProTac 2L-X USB FAQ
Which is smaller, the Olight ArkTac or the Streamlight ProTac 2L-X USB?
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 135.5 mm (5.33 in), a difference of 4.9 mm (4%). At its widest point the Streamlight ProTac 2L-X USB is 2.1 mm slimmer (26.9 vs 29 mm). The Streamlight ProTac 2L-X USB is 11 g lighter (125 g vs 136 g, with battery).
Which is brighter, the Olight ArkTac or the Streamlight ProTac 2L-X USB?
The Olight ArkTac is rated brighter: 1,700 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 240% more.
Which is cheaper, the Olight ArkTac or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Olight ArkTac was $119.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $36.94 less. Prices change often, so check the current price before you buy.
Do the Olight ArkTac and Streamlight ProTac 2L-X USB use the same battery?
The Olight ArkTac 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 ArkTac with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Olight ArkTac: specs from Olight product page (manufacturer). Price $119.99 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. Price $83.05 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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