Fenix PD40R V3.0 vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 12.4 mm (0.49 in) shorter than the Fenix PD40R V3.0, and 7.1 mm narrower at its widest point. It is 73 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 12.4 mm (0.49 in) shorter than the Fenix PD40R V3.0, and 7.1 mm narrower at its widest point. It is 73 g lighter (with battery).
Dimensions
| Fenix PD40R V3.0 Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 143 mm (5.63 in) | 130.6 mm (5.14 in)−12.4 mm |
| Head / width | 34 mm (1.34 in) | 26.9 mm (1.06 in)−7.1 mm |
| Body | 26 mm (1.02 in) | 23.9 mm (0.94 in)−2.1 mm |
| Weight | 198 g with battery | 125 g with battery−73 g |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 3,000 lm | 500 lm |
| Throw | 500 m | — |
| Type | EDC | EDC |
| Price | $119.95 at fenixlighting.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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PD40R V3.0 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 143 mm (5.63 in), a difference of 12.4 mm (9%). At its widest point the Streamlight ProTac 2L-X USB is 7.1 mm slimmer (26.9 vs 34 mm). The Streamlight ProTac 2L-X USB is 73 g lighter (125 g vs 198 g, with battery).
Brightness and throw
The Fenix PD40R V3.0 is rated brighter: 3,000 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 500% more.
Battery
The Fenix PD40R V3.0 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 Fenix PD40R V3.0 was $119.95 at fenixlighting.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 Fenix PD40R V3.0 if you want more output (3,000 lm vs 500 lm). Choose the Streamlight ProTac 2L-X USB if you want a shorter light (12.4 mm shorter), a slimmer profile (7.1 mm narrower) and less weight (73 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix PD40R V3.0 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
PD40R V3.0 vs ProTac 2L-X USB FAQ
Which is smaller, the Fenix PD40R V3.0 or the Streamlight ProTac 2L-X USB?
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 143 mm (5.63 in), a difference of 12.4 mm (9%). At its widest point the Streamlight ProTac 2L-X USB is 7.1 mm slimmer (26.9 vs 34 mm). The Streamlight ProTac 2L-X USB is 73 g lighter (125 g vs 198 g, with battery).
Which is brighter, the Fenix PD40R V3.0 or the Streamlight ProTac 2L-X USB?
The Fenix PD40R V3.0 is rated brighter: 3,000 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 500% more.
Which is cheaper, the Fenix PD40R V3.0 or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Fenix PD40R V3.0 was $119.95 at fenixlighting.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 Fenix PD40R V3.0 and Streamlight ProTac 2L-X USB use the same battery?
The Fenix PD40R V3.0 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 Fenix PD40R V3.0 with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Fenix PD40R V3.0: specs from Fenix product page (manufacturer). Drawing: shape measured from manufacturer photo (batteryjunction.com), scaled to the published length and diameter. Price $119.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- 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.
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