Fenix LD35R vs Olight Seeker 4 size comparison
The Olight Seeker 4 is 2.4 mm (0.09 in) shorter than the Fenix LD35R, and 1 mm wider at its widest point. It is 20 g heavier (with battery).
The Olight Seeker 4 is 2.4 mm (0.09 in) shorter than the Fenix LD35R, and 1 mm wider at its widest point. It is 20 g heavier (with battery).
Dimensions
| Fenix LD35R Check price ↗ | Olight Seeker 4 Check price ↗ | |
| Length | 136.4 mm (5.37 in) | 134 mm (5.28 in)−2.4 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 | 205 g with battery+20 g |
| Battery | 18650 / 2x CR123A | 21700 |
| Max output | 1,800 lm | 3,100 lm |
| Throw | 337 m | — |
| Type | EDC | EDC not on olight.com (US) |
| Price | $89.95 at fenixlighting.com, as of Nov 4, 2026 | not verified yet |
| Source | fenixlighting.com sourced | batteryjunction.com sourced Retailer lists 400 m throw, which conflicts with Olight figures for the series; throw omitted |
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LD35R vs Seeker 4: how they differ
Size and weight
The Olight Seeker 4 is the shorter light: 134 mm (5.28 in) against 136.4 mm (5.37 in), a difference of 2.4 mm (2%). At its widest point the Fenix LD35R is 1 mm slimmer (34 vs 35 mm). The Fenix LD35R is 20 g lighter (185 g vs 205 g, with battery).
Brightness and throw
The Olight Seeker 4 is rated brighter: 3,100 lm maximum vs 1,800 lm for the Fenix LD35R, 72% more.
Battery
The Fenix LD35R runs on removable 18650 / 2x CR123A batteries; the Olight Seeker 4 runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
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 (20 g lighter). Choose the Olight Seeker 4 if you want more output (3,100 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 4
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LD35R vs Seeker 4 FAQ
Which is smaller, the Fenix LD35R or the Olight Seeker 4?
The Olight Seeker 4 is the shorter light: 134 mm (5.28 in) against 136.4 mm (5.37 in), a difference of 2.4 mm (2%). At its widest point the Fenix LD35R is 1 mm slimmer (34 vs 35 mm). The Fenix LD35R is 20 g lighter (185 g vs 205 g, with battery).
Which is brighter, the Fenix LD35R or the Olight Seeker 4?
The Olight Seeker 4 is rated brighter: 3,100 lm maximum vs 1,800 lm for the Fenix LD35R, 72% more.
Do the Fenix LD35R and Olight Seeker 4 use the same battery?
The Fenix LD35R runs on removable 18650 / 2x CR123A batteries; the Olight Seeker 4 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 4 with similar lights
More
Sources
- Fenix LD35R: specs from Fenix product page (manufacturer). Drawing: outline from published specs. Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Olight Seeker 4: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: shape measured from manufacturer photo (batteryjunction.com), scaled to the published length and diameter. No verified price yet.
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