Emisar D4K vs Fenix UC35 V2.0 USB size comparison
The Fenix UC35 V2.0 USB is 37 mm (1.46 in) longer than the Emisar D4K, and 2.6 mm narrower at its widest point. It is 31 g heavier (without battery).
The Fenix UC35 V2.0 USB is 37 mm (1.46 in) longer than the Emisar D4K, and 2.6 mm narrower at its widest point. It is 31 g heavier (without battery).
Dimensions
| Emisar D4K Check price ↗ | Fenix UC35 V2.0 USB Check price ↗ | |
| Length | 103 mm (4.06 in) | 140 mm (5.51 in)+37 mm |
| Head / width | 28 mm (1.10 in) | 25.4 mm (1.00 in)−2.6 mm |
| Body | 26.5 mm (1.04 in) | 23.5 mm (0.93 in)−3 mm |
| Weight | 58 g without battery | 89 g without battery+31 g |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | — | 1,000 lm |
| Throw | — | 266 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | $89.95 at fenixlighting.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Output depends on LED option | fenixlighting.com sourced |
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D4K vs UC35 V2.0 USB: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 140 mm (5.51 in), a difference of 37 mm (26%). At its widest point the Fenix UC35 V2.0 USB is 2.6 mm slimmer (25.4 vs 28 mm). The Emisar D4K is 31 g lighter (58 g vs 89 g, without battery).
Brightness and throw
The Fenix UC35 V2.0 USB is rated at 1,000 lm; we have no published maximum for the Emisar D4K. Output for the Emisar D4K depends on the LED option chosen.
Battery
The Emisar D4K runs on a removable 21700 battery; the Fenix UC35 V2.0 USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Fenix UC35 V2.0 USB $89.95 at fenixlighting.com, so the Emisar D4K cost $50.26 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 Emisar D4K if you want a shorter light (37 mm shorter) and less weight (31 g lighter). Choose the Fenix UC35 V2.0 USB if you want a slimmer profile (2.6 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4K Check price ↗ Fenix UC35 V2.0 USB
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D4K vs UC35 V2.0 USB FAQ
Which is smaller, the Emisar D4K or the Fenix UC35 V2.0 USB?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 140 mm (5.51 in), a difference of 37 mm (26%). At its widest point the Fenix UC35 V2.0 USB is 2.6 mm slimmer (25.4 vs 28 mm). The Emisar D4K is 31 g lighter (58 g vs 89 g, without battery).
Which is cheaper, the Emisar D4K or the Fenix UC35 V2.0 USB?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Fenix UC35 V2.0 USB $89.95 at fenixlighting.com, so the Emisar D4K cost $50.26 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Fenix UC35 V2.0 USB use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Fenix UC35 V2.0 USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Emisar D4K with similar lights
Compare Fenix UC35 V2.0 USB with similar lights
More
Sources
- Emisar D4K: specs from Emisar product page (manufacturer). Price $39.69 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
- Fenix UC35 V2.0 USB: specs from Fenix product page (manufacturer). Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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