Olight Seeker 3 Pro vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 1.4 mm (0.06 in) shorter than the Olight Seeker 3 Pro, and 8.1 mm narrower at its widest point. It is 75 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 1.4 mm (0.06 in) shorter than the Olight Seeker 3 Pro, and 8.1 mm narrower at its widest point. It is 75 g lighter (with battery).
Dimensions
| Olight Seeker 3 Pro Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 132 mm (5.20 in) | 130.6 mm (5.14 in)−1.4 mm |
| Head / width | 35 mm (1.38 in) | 26.9 mm (1.06 in)−8.1 mm |
| Body | 28 mm (1.10 in) | 23.9 mm (0.94 in)−4.1 mm |
| Weight | 200 g with battery | 125 g with battery−75 g |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 4,200 lm | 500 lm |
| Throw | 250 m | — |
| Type | EDC not on olight.com (US) | EDC |
| Price | $139.95 at batteryjunction.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | batteryjunction.com sourced | batteryjunction.com sourced |
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Seeker 3 Pro 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 132 mm (5.20 in), a difference of 1.4 mm (1%). At its widest point the Streamlight ProTac 2L-X USB is 8.1 mm slimmer (26.9 vs 35 mm). The Streamlight ProTac 2L-X USB is 75 g lighter (125 g vs 200 g, with battery).
Brightness and throw
The Olight Seeker 3 Pro is rated brighter: 4,200 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 740% more.
Battery
The Olight Seeker 3 Pro runs on a removable 21700 battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Olight Seeker 3 Pro was $139.95 at batteryjunction.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $56.90 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Olight Seeker 3 Pro if you want more output (4,200 lm vs 500 lm). Choose the Streamlight ProTac 2L-X USB if you want a slimmer profile (8.1 mm narrower) and less weight (75 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Olight Seeker 3 Pro Check price ↗ Streamlight ProTac 2L-X USB
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Seeker 3 Pro vs ProTac 2L-X USB FAQ
Which is smaller, the Olight Seeker 3 Pro or the Streamlight ProTac 2L-X USB?
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 132 mm (5.20 in), a difference of 1.4 mm (1%). At its widest point the Streamlight ProTac 2L-X USB is 8.1 mm slimmer (26.9 vs 35 mm). The Streamlight ProTac 2L-X USB is 75 g lighter (125 g vs 200 g, with battery).
Which is brighter, the Olight Seeker 3 Pro or the Streamlight ProTac 2L-X USB?
The Olight Seeker 3 Pro is rated brighter: 4,200 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 740% more.
Which is cheaper, the Olight Seeker 3 Pro or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Olight Seeker 3 Pro was $139.95 at batteryjunction.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $56.90 less. Prices change often, so check the current price before you buy.
Do the Olight Seeker 3 Pro and Streamlight ProTac 2L-X USB use the same battery?
The Olight Seeker 3 Pro runs on a removable 21700 battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Olight Seeker 3 Pro with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Olight Seeker 3 Pro: specs from manufacturer published specs as listed by batteryjunction.com. Price $139.95 from batteryjunction.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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