Fenix LD35R vs Olight Seeker Ultra size comparison
The Olight Seeker Ultra is 1.6 mm (0.06 in) longer than the Fenix LD35R, and 1 mm wider at its widest point. It is 35 g heavier (with battery).
The Olight Seeker Ultra is 1.6 mm (0.06 in) longer than the Fenix LD35R, and 1 mm wider at its widest point. It is 35 g heavier (with battery).
Dimensions
| Fenix LD35R Check price ↗ | Olight Seeker Ultra Check price ↗ | |
| Length | 136.4 mm (5.37 in) | 138 mm (5.43 in)+1.6 mm |
| Head / width | 34 mm (1.34 in) | 35 mm (1.38 in)+1 mm |
| Body | 25.4 mm (1.00 in) | 28 mm (1.10 in)+2.6 mm |
| Weight | 185 g with battery | 220 g with battery+35 g |
| Battery | 18650 / 2x CR123A | 21700 |
| Max output | 1,800 lm | 4,800 lm |
| Throw | 337 m | 265 m |
| Type | EDC | EDC |
| Price | $89.95 at fenixlighting.com, as of Nov 4, 2026 | $169.99 at olight.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | olight.com sourced Body diameter and throw from Battery Junction |
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LD35R vs Seeker Ultra: how they differ
Size and weight
The Fenix LD35R is the shorter light: 136.4 mm (5.37 in) against 138 mm (5.43 in), a difference of 1.6 mm (1%). At its widest point the Fenix LD35R is 1 mm slimmer (34 vs 35 mm). The Fenix LD35R is 35 g lighter (185 g vs 220 g, with battery).
Brightness and throw
The Olight Seeker Ultra is rated brighter: 4,800 lm maximum vs 1,800 lm for the Fenix LD35R, 167% more. For beam distance the Fenix LD35R reaches further: 337 m vs 265 m rated throw (27% more).
Battery
The Fenix LD35R runs on removable 18650 / 2x CR123A batteries; the Olight Seeker Ultra runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Price
When we checked on Nov 4, 2026, the Fenix LD35R was $89.95 at fenixlighting.com and the Olight Seeker Ultra $169.99 at olight.com, so the Fenix LD35R cost $80.04 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 Fenix LD35R if you want less weight (35 g lighter) and longer throw (337 m vs 265 m). Choose the Olight Seeker Ultra if you want more output (4,800 lm vs 1,800 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix LD35R Check price ↗ Olight Seeker Ultra
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
LD35R vs Seeker Ultra FAQ
Which is smaller, the Fenix LD35R or the Olight Seeker Ultra?
The Fenix LD35R is the shorter light: 136.4 mm (5.37 in) against 138 mm (5.43 in), a difference of 1.6 mm (1%). At its widest point the Fenix LD35R is 1 mm slimmer (34 vs 35 mm). The Fenix LD35R is 35 g lighter (185 g vs 220 g, with battery).
Which is brighter, the Fenix LD35R or the Olight Seeker Ultra?
The Olight Seeker Ultra is rated brighter: 4,800 lm maximum vs 1,800 lm for the Fenix LD35R, 167% more. For beam distance the Fenix LD35R reaches further: 337 m vs 265 m rated throw (27% more).
Which is cheaper, the Fenix LD35R or the Olight Seeker Ultra?
When we checked on Nov 4, 2026, the Fenix LD35R was $89.95 at fenixlighting.com and the Olight Seeker Ultra $169.99 at olight.com, so the Fenix LD35R cost $80.04 less. Prices change often, so check the current price before you buy.
Do the Fenix LD35R and Olight Seeker Ultra use the same battery?
The Fenix LD35R runs on removable 18650 / 2x CR123A batteries; the Olight Seeker Ultra runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Compare Fenix LD35R with similar lights
Compare Olight Seeker Ultra with similar lights
More
Sources
- Fenix LD35R: specs from Fenix product page (manufacturer). Price $89.95 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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