Olight ArkTac Ultra vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 5 mm (0.20 in) shorter than the Olight ArkTac Ultra, and 2.1 mm narrower at its widest point. It is 15 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 5 mm (0.20 in) shorter than the Olight ArkTac Ultra, and 2.1 mm narrower at its widest point. It is 15 g lighter (with battery).
Dimensions
| Olight ArkTac Ultra Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 135.6 mm (5.34 in) | 130.6 mm (5.14 in)−5 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 | 140 g with battery | 125 g with battery−15 g |
| Battery | Built-in | 18650 / 2x CR123A |
| Max output | — | 500 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $159.99 at olight.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | olight.com unverified Dims from ArkTac series comparison table (row assumed to be Ultra); re-check on ArkTac Ultra page | batteryjunction.com sourced |
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
ArkTac Ultra 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 135.6 mm (5.34 in), a difference of 5 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 15 g lighter (125 g vs 140 g, with battery).
Brightness and throw
The Streamlight ProTac 2L-X USB is rated at 500 lm; we have no published maximum for the Olight ArkTac Ultra.
Battery
The Olight ArkTac 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 ArkTac Ultra was $159.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $76.94 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 Ultra if you want a built-in battery with no separate cell to buy. Choose the Streamlight ProTac 2L-X USB if you want a shorter light (5 mm shorter), a slimmer profile (2.1 mm narrower), less weight (15 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 Ultra 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 Ultra vs ProTac 2L-X USB FAQ
Which is smaller, the Olight ArkTac Ultra or the Streamlight ProTac 2L-X USB?
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 135.6 mm (5.34 in), a difference of 5 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 15 g lighter (125 g vs 140 g, with battery).
Which is cheaper, the Olight ArkTac Ultra or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Olight ArkTac Ultra was $159.99 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $76.94 less. Prices change often, so check the current price before you buy.
Do the Olight ArkTac Ultra and Streamlight ProTac 2L-X USB use the same battery?
The Olight ArkTac 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 ArkTac Ultra with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Olight ArkTac Ultra: specs from Olight product page (manufacturer). Some values could not be confirmed on a second source and are marked unverified. Price $159.99 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.
Found an error? Email [email protected] and we will fix it.