Olight Seeker 3 vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 2.6 mm (0.10 in) longer than the Olight Seeker 3, and 8.1 mm narrower at its widest point. It is 59 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 2.6 mm (0.10 in) longer than the Olight Seeker 3, and 8.1 mm narrower at its widest point. It is 59 g lighter (with battery).
Dimensions
| Olight Seeker 3 Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 128 mm (5.04 in) | 130.6 mm (5.14 in)+2.6 mm |
| Head / width | 35 mm (1.38 in) | 26.9 mm (1.06 in)−8.1 mm |
| Body | 27.5 mm (1.08 in) | 23.9 mm (0.94 in)−3.6 mm |
| Weight | 184 g with battery | 125 g with battery−59 g |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 3,500 lm | 500 lm |
| Throw | 220 m | — |
| Type | EDC | EDC |
| Price | $119.95 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 |
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
Seeker 3 vs ProTac 2L-X USB: how they differ
Size and weight
The Olight Seeker 3 is the shorter light: 128 mm (5.04 in) against 130.6 mm (5.14 in), a difference of 2.6 mm (2%). 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 59 g lighter (125 g vs 184 g, with battery).
Brightness and throw
The Olight Seeker 3 is rated brighter: 3,500 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 600% more.
Battery
The Olight Seeker 3 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 was $119.95 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $36.90 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 if you want more output (3,500 lm vs 500 lm). Choose the Streamlight ProTac 2L-X USB if you want a slimmer profile (8.1 mm narrower) and less weight (59 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Olight Seeker 3 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
Seeker 3 vs ProTac 2L-X USB FAQ
Which is smaller, the Olight Seeker 3 or the Streamlight ProTac 2L-X USB?
The Olight Seeker 3 is the shorter light: 128 mm (5.04 in) against 130.6 mm (5.14 in), a difference of 2.6 mm (2%). 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 59 g lighter (125 g vs 184 g, with battery).
Which is brighter, the Olight Seeker 3 or the Streamlight ProTac 2L-X USB?
The Olight Seeker 3 is rated brighter: 3,500 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 600% more.
Which is cheaper, the Olight Seeker 3 or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Olight Seeker 3 was $119.95 at olight.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $36.90 less. Prices change often, so check the current price before you buy.
Do the Olight Seeker 3 and Streamlight ProTac 2L-X USB use the same battery?
The Olight Seeker 3 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 with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Olight Seeker 3: specs from Olight product page (manufacturer). Price $119.95 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 liambuehlerbusiness@gmail.com and we will fix it.