Fenix E40R vs Olight Seeker 4 size comparison
The Olight Seeker 4 is 4 mm (0.16 in) shorter than the Fenix E40R, with about the same max diameter/width. It is 15 g lighter (with battery).
The Olight Seeker 4 is 4 mm (0.16 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 Check price ↗ | |
| Length | 138 mm (5.43 in) | 134 mm (5.28 in)−4 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 | 3,100 lm |
| Throw | 242 m | — |
| Type | EDC | EDC not on olight.com (US) |
| Price | $109.95 at fenixlighting.com, as of Nov 4, 2026 | not verified yet |
| Source | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high | batteryjunction.com sourced Retailer lists 400 m throw, which conflicts with Olight figures for the series; throw omitted |
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E40R vs Seeker 4: how they differ
Size and weight
The Olight Seeker 4 is the shorter light: 134 mm (5.28 in) against 138 mm (5.43 in), a difference of 4 mm (3%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 4 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 3,100 lm for the Olight Seeker 4, 61% more.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
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 3,100 lm). Choose the Olight Seeker 4 if you want a shorter light (4 mm shorter) and less weight (15 g lighter). 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
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E40R vs Seeker 4 FAQ
Which is smaller, the Fenix E40R or the Olight Seeker 4?
The Olight Seeker 4 is the shorter light: 134 mm (5.28 in) against 138 mm (5.43 in), a difference of 4 mm (3%). At their widest points they are about the same (35 vs 35 mm). The Olight Seeker 4 is 15 g lighter (205 g vs 220 g, with battery).
Which is brighter, the Fenix E40R or the Olight Seeker 4?
The Fenix E40R is rated brighter: 5,000 lm maximum vs 3,100 lm for the Olight Seeker 4, 61% more.
Do the Fenix E40R and Olight Seeker 4 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 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: specs from manufacturer published specs as listed by batteryjunction.com. No verified price yet.
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