Fenix E40R vs Olight Seeker 4 Pro size comparison
The Olight Seeker 4 Pro is 5 mm (0.20 in) shorter than the Fenix E40R, with about the same max diameter/width. It is 15 g lighter (with battery).
The Olight Seeker 4 Pro is 5 mm (0.20 in) shorter than the Fenix E40R, with about the same max diameter/width. It is 15 g lighter (with battery).
Dimensions
| Fenix E40R Check price ↗ | Olight Seeker 4 Pro Check price ↗ | |
| Length | 138 mm (5.43 in) | 133 mm (5.24 in)−5 mm |
| Head / width | 35 mm (1.38 in) | 35 mm (1.38 in)same |
| Body | 26.4 mm (1.04 in) | 28 mm (1.10 in)+1.6 mm |
| Weight | 220 g with battery | 205 g with battery−15 g |
| Battery | 21700 | 21700 |
| Max output | 5,000 lm | 4,600 lm |
| Throw | 242 m | 260 m |
| Type | EDC | EDC |
| Price | $109.95 at fenixlighting.com, as of Nov 4, 2026 | $139.99 at olight.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high | olight.com sourced |
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E40R vs Seeker 4 Pro: how they differ
Size and weight
The Olight Seeker 4 Pro is the shorter light: 133 mm (5.24 in) against 138 mm (5.43 in), a difference of 5 mm (4%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 4 Pro is 15 g lighter (205 g vs 220 g, with battery).
Brightness and throw
The Fenix E40R is rated brighter: 5,000 lm maximum vs 4,600 lm for the Olight Seeker 4 Pro, 9% more. For beam distance the Olight Seeker 4 Pro reaches further: 260 m vs 242 m rated throw (7% 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 Fenix E40R was $109.95 at fenixlighting.com and the Olight Seeker 4 Pro $139.99 at olight.com, so the Fenix E40R cost $30.04 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 4 Pro if you want a shorter light (5 mm shorter) and less weight (15 g lighter). On the specs we track, the Olight Seeker 4 Pro is ahead or level everywhere; the Fenix E40R 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 ↗ Fenix E40R Check price ↗ Olight Seeker 4 Pro
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E40R vs Seeker 4 Pro FAQ
Which is smaller, the Fenix E40R or the Olight Seeker 4 Pro?
The Olight Seeker 4 Pro is the shorter light: 133 mm (5.24 in) against 138 mm (5.43 in), a difference of 5 mm (4%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 4 Pro is 15 g lighter (205 g vs 220 g, with battery).
Which is brighter, the Fenix E40R or the Olight Seeker 4 Pro?
The Fenix E40R is rated brighter: 5,000 lm maximum vs 4,600 lm for the Olight Seeker 4 Pro, 9% more. For beam distance the Olight Seeker 4 Pro reaches further: 260 m vs 242 m rated throw (7% more).
Which is cheaper, the Fenix E40R or the Olight Seeker 4 Pro?
When we checked on Nov 4, 2026, the Fenix E40R was $109.95 at fenixlighting.com and the Olight Seeker 4 Pro $139.99 at olight.com, so the Fenix E40R cost $30.04 less. Prices change often, so check the current price before you buy.
Do the Fenix E40R and Olight Seeker 4 Pro use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Fenix E40R with similar lights
Compare Olight Seeker 4 Pro 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.
- Olight Seeker 4 Pro: specs from Olight product page (manufacturer). Price $139.99 from olight.com, checked Nov 4, 2026; prices change often.
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