Fenix E40R vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 7.4 mm (0.29 in) shorter than the Fenix E40R, and 8.1 mm narrower at its widest point. It is 95 g lighter (with battery).
The Streamlight ProTac 2L-X USB is 7.4 mm (0.29 in) shorter than the Fenix E40R, and 8.1 mm narrower at its widest point. It is 95 g lighter (with battery).
Dimensions
| Fenix E40R Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 138 mm (5.43 in) | 130.6 mm (5.14 in)−7.4 mm |
| Head / width | 35 mm (1.38 in) | 26.9 mm (1.06 in)−8.1 mm |
| Body | 26.4 mm (1.04 in) | 23.9 mm (0.94 in)−2.5 mm |
| Weight | 220 g with battery | 125 g with battery−95 g |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 5,000 lm | 500 lm |
| Throw | 242 m | — |
| Type | EDC | EDC |
| Price | $109.95 at fenixlighting.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high | batteryjunction.com sourced |
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E40R 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 138 mm (5.43 in), a difference of 7.4 mm (5%). 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 95 g lighter (125 g vs 220 g, with battery).
Brightness and throw
The Fenix E40R is rated brighter: 5,000 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 900% more.
Battery
The Fenix E40R 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 E40R was $109.95 at fenixlighting.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $26.90 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 E40R if you want more output (5,000 lm vs 500 lm). Choose the Streamlight ProTac 2L-X USB if you want a shorter light (7.4 mm shorter), a slimmer profile (8.1 mm narrower) and less weight (95 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix E40R 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
E40R vs ProTac 2L-X USB FAQ
Which is smaller, the Fenix E40R or the Streamlight ProTac 2L-X USB?
The Streamlight ProTac 2L-X USB is the shorter light: 130.6 mm (5.14 in) against 138 mm (5.43 in), a difference of 7.4 mm (5%). 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 95 g lighter (125 g vs 220 g, with battery).
Which is brighter, the Fenix E40R or the Streamlight ProTac 2L-X USB?
The Fenix E40R is rated brighter: 5,000 lm maximum vs 500 lm for the Streamlight ProTac 2L-X USB, 900% more.
Which is cheaper, the Fenix E40R or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Fenix E40R was $109.95 at fenixlighting.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Streamlight ProTac 2L-X USB cost $26.90 less. Prices change often, so check the current price before you buy.
Do the Fenix E40R and Streamlight ProTac 2L-X USB use the same battery?
The Fenix E40R 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 E40R with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Fenix E40R: specs from Fenix product page (manufacturer). Price $109.95 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. Price $83.05 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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