Fenix E40R vs Olight Seeker Ultra size comparison
The Olight Seeker Ultra is about the same length as the Fenix E40R, with about the same max diameter/width. It is about the same weight (with battery).
The Olight Seeker Ultra is about the same length as the Fenix E40R, with about the same max diameter/width. It is about the same weight (with battery).
Dimensions
| Fenix E40R Check price ↗ | Olight Seeker Ultra Check price ↗ | |
| Length | 138 mm (5.43 in) | 138 mm (5.43 in)same |
| 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 | 220 g with batterysame |
| Battery | 21700 | 21700 |
| Max output | 5,000 lm | 4,800 lm |
| Throw | 242 m | 265 m |
| Type | EDC | EDC |
| Price | $109.95 at fenixlighting.com, as of Nov 4, 2026 | $169.99 at olight.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high | olight.com sourced Body diameter and throw from Battery Junction |
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E40R vs Seeker Ultra: how they differ
Size and weight
The Fenix E40R and Olight Seeker Ultra are the same length to within half a millimetre (138 mm (5.43 in)). At their widest points they are about the same (35 vs 35 mm). They weigh about the same (220 g, with battery).
Brightness and throw
The Fenix E40R is rated brighter: 5,000 lm maximum vs 4,800 lm for the Olight Seeker Ultra, 4% more. For beam distance the Olight Seeker Ultra reaches further: 265 m vs 242 m rated throw (10% 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 Ultra $169.99 at olight.com, so the Fenix E40R cost $60.04 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?
On the specs we track, these two are closely matched, so decide on price, user interface and the features you care about. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix E40R Check price ↗ Olight Seeker Ultra
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E40R vs Seeker Ultra FAQ
Which is smaller, the Fenix E40R or the Olight Seeker Ultra?
The Fenix E40R and Olight Seeker Ultra are the same length to within half a millimetre (138 mm (5.43 in)). At their widest points they are about the same (35 vs 35 mm). They weigh about the same (220 g, with battery).
Which is brighter, the Fenix E40R or the Olight Seeker Ultra?
The Fenix E40R is rated brighter: 5,000 lm maximum vs 4,800 lm for the Olight Seeker Ultra, 4% more. For beam distance the Olight Seeker Ultra reaches further: 265 m vs 242 m rated throw (10% more).
Which is cheaper, the Fenix E40R or the Olight Seeker Ultra?
When we checked on Nov 4, 2026, the Fenix E40R was $109.95 at fenixlighting.com and the Olight Seeker Ultra $169.99 at olight.com, so the Fenix E40R cost $60.04 less. Prices change often, so check the current price before you buy.
Do the Fenix E40R and Olight Seeker Ultra 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 Ultra 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 Ultra: specs from Olight product page (manufacturer). Price $169.99 from olight.com, checked Nov 4, 2026; prices change often.
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