Olight Seeker 3 vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 3 mm (0.12 in) shorter than the Olight Seeker 3, with about the same max diameter/width. It is 13 g heavier (with battery).
The ThruNite TC20 V3 is 3 mm (0.12 in) shorter than the Olight Seeker 3, with about the same max diameter/width. It is 13 g heavier (with battery).
Dimensions
| Olight Seeker 3 Check price ↗ | ThruNite TC20 V3 Check price ↗ | |
| Length | 128 mm (5.04 in) | 125 mm (4.92 in)−3 mm |
| Head / width | 35 mm (1.38 in) | 35 mm (1.38 in)same |
| Body | 27.5 mm (1.08 in) | 28 mm (1.10 in)+0.5 mm |
| Weight | 184 g with battery | 197 g with battery+13 g |
| Battery | 21700 | 21700 |
| Max output | 3,500 lm | 4,720 lm |
| Throw | 220 m | — |
| Type | EDC | EDC |
| Price | $119.95 at olight.com, as of Nov 4, 2026 | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | olight.com sourced | batteryjunction.com sourced |
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Seeker 3 vs TC20 V3: how they differ
Size and weight
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 128 mm (5.04 in), a difference of 3 mm (2%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 3 is 13 g lighter (184 g vs 197 g, with battery).
Brightness and throw
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 3,500 lm for the Olight Seeker 3, 35% more.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Olight Seeker 3 was $119.95 at olight.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $40.00 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 less weight (13 g lighter). Choose the ThruNite TC20 V3 if you want a shorter light (3 mm shorter) and more output (4,720 lm vs 3,500 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Olight Seeker 3 Check price ↗ ThruNite TC20 V3
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
Seeker 3 vs TC20 V3 FAQ
Which is smaller, the Olight Seeker 3 or the ThruNite TC20 V3?
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 128 mm (5.04 in), a difference of 3 mm (2%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 3 is 13 g lighter (184 g vs 197 g, with battery).
Which is brighter, the Olight Seeker 3 or the ThruNite TC20 V3?
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 3,500 lm for the Olight Seeker 3, 35% more.
Which is cheaper, the Olight Seeker 3 or the ThruNite TC20 V3?
When we checked on Nov 4, 2026, the Olight Seeker 3 was $119.95 at olight.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $40.00 less. Prices change often, so check the current price before you buy.
Do the Olight Seeker 3 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 3 with similar lights
Compare ThruNite TC20 V3 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.
- 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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