Streamlight ProTac 2L-X USB vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 5.6 mm (0.22 in) shorter than the Streamlight ProTac 2L-X USB, and 8.1 mm wider at its widest point. It is 72 g heavier (with battery).
The ThruNite TC20 V3 is 5.6 mm (0.22 in) shorter than the Streamlight ProTac 2L-X USB, and 8.1 mm wider at its widest point. It is 72 g heavier (with battery).
Dimensions
| Streamlight ProTac 2L-X USB Check price ↗ | ThruNite TC20 V3 Check price ↗ | |
| Length | 130.6 mm (5.14 in) | 125 mm (4.92 in)−5.6 mm |
| Head / width | 26.9 mm (1.06 in) | 35 mm (1.38 in)+8.1 mm |
| Body | 23.9 mm (0.94 in) | 28 mm (1.10 in)+4.1 mm |
| Weight | 125 g with battery | 197 g with battery+72 g |
| Battery | 18650 / 2x CR123A | 21700 |
| Max output | 500 lm | 4,720 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $83.05 at batteryjunction.com, as of Nov 4, 2026 | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | batteryjunction.com sourced | batteryjunction.com sourced |
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ProTac 2L-X USB vs TC20 V3: how they differ
Size and weight
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 130.6 mm (5.14 in), a difference of 5.6 mm (4%). 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 72 g lighter (125 g vs 197 g, with battery).
Brightness and throw
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 844% more.
Battery
The Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries; the ThruNite TC20 V3 runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Price
When we checked on Nov 4, 2026, the Streamlight ProTac 2L-X USB was $83.05 at batteryjunction.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $3.10 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 Streamlight ProTac 2L-X USB if you want a slimmer profile (8.1 mm narrower) and less weight (72 g lighter). Choose the ThruNite TC20 V3 if you want a shorter light (5.6 mm shorter) and more output (4,720 lm vs 500 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Streamlight ProTac 2L-X USB Check price ↗ ThruNite TC20 V3
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
ProTac 2L-X USB vs TC20 V3 FAQ
Which is smaller, the Streamlight ProTac 2L-X USB or the ThruNite TC20 V3?
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 130.6 mm (5.14 in), a difference of 5.6 mm (4%). 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 72 g lighter (125 g vs 197 g, with battery).
Which is brighter, the Streamlight ProTac 2L-X USB or the ThruNite TC20 V3?
The ThruNite TC20 V3 is rated brighter: 4,720 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 844% more.
Which is cheaper, the Streamlight ProTac 2L-X USB or the ThruNite TC20 V3?
When we checked on Nov 4, 2026, the Streamlight ProTac 2L-X USB was $83.05 at batteryjunction.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $3.10 less. Prices change often, so check the current price before you buy.
Do the Streamlight ProTac 2L-X USB and ThruNite TC20 V3 use the same battery?
The Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries; the ThruNite TC20 V3 runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Compare Streamlight ProTac 2L-X USB with similar lights
Compare ThruNite TC20 V3 with similar lights
More
Sources
- Streamlight ProTac 2L-X USB: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $83.05 from batteryjunction.com, checked Nov 4, 2026; prices change often.
- ThruNite TC20 V3: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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