Olight Seeker 4 vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 9 mm (0.35 in) shorter than the Olight Seeker 4, with about the same max diameter/width. It is 8 g lighter (with battery).
The ThruNite TC20 V3 is 9 mm (0.35 in) shorter than the Olight Seeker 4, with about the same max diameter/width. It is 8 g lighter (with battery).
Dimensions
| Olight Seeker 4 Check price ↗ | ThruNite TC20 V3 Check price ↗ | |
| Length | 134 mm (5.28 in) | 125 mm (4.92 in)−9 mm |
| Head / width | 35 mm (1.38 in) | 35 mm (1.38 in)same |
| Body | 28 mm (1.10 in) | 28 mm (1.10 in)same |
| Weight | 205 g with battery | 197 g with battery−8 g |
| Battery | 21700 | 21700 |
| Max output | 3,100 lm | 4,720 lm |
| Throw | — | — |
| Type | EDC not on olight.com (US) | EDC |
| Price | not verified yet | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | batteryjunction.com sourced Retailer lists 400 m throw, which conflicts with Olight figures for the series; throw omitted | batteryjunction.com sourced |
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Seeker 4 vs TC20 V3: how they differ
Size and weight
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 134 mm (5.28 in), a difference of 9 mm (7%). At their widest points they are about the same (35 vs 35 mm). The ThruNite TC20 V3 is 8 g lighter (197 g vs 205 g, with battery).
Brightness and throw
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 3,100 lm for the Olight Seeker 4, 52% more.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the ThruNite TC20 V3 if you want a shorter light (9 mm shorter) and more output (4,720 lm vs 3,100 lm). On the specs we track, the ThruNite TC20 V3 is ahead or level everywhere; the Olight Seeker 4 makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Olight Seeker 4 Check price ↗ ThruNite TC20 V3
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Seeker 4 vs TC20 V3 FAQ
Which is smaller, the Olight Seeker 4 or the ThruNite TC20 V3?
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 134 mm (5.28 in), a difference of 9 mm (7%). At their widest points they are about the same (35 vs 35 mm). The ThruNite TC20 V3 is 8 g lighter (197 g vs 205 g, with battery).
Which is brighter, the Olight Seeker 4 or the ThruNite TC20 V3?
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 3,100 lm for the Olight Seeker 4, 52% more.
Do the Olight Seeker 4 and ThruNite TC20 V3 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Olight Seeker 4 with similar lights
Compare ThruNite TC20 V3 with similar lights
More
Sources
- Olight Seeker 4: specs from manufacturer published specs as listed by batteryjunction.com. No verified price yet.
- ThruNite TC20 V3: specs from manufacturer published specs as listed by batteryjunction.com. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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