Emisar D4K vs Fenix LD12R size comparison
The Fenix LD12R is 18 mm (0.71 in) longer than the Emisar D4K, and 6 mm narrower at its widest point. Weights are published on different bases (with battery vs without battery), so compare them with care.
The Fenix LD12R is 18 mm (0.71 in) longer than the Emisar D4K, and 6 mm narrower at its widest point. Weights are published on different bases (with battery vs without battery), so compare them with care.
Dimensions
| Emisar D4K Check price ↗ | Fenix LD12R Check price ↗ | |
| Length | 103 mm (4.06 in) | 121 mm (4.76 in)+18 mm |
| Head / width | 28 mm (1.10 in) | 22 mm (0.87 in)−6 mm |
| Body | 26.5 mm (1.04 in) | 19 mm (0.75 in)−7.5 mm |
| Weight | 58 g without battery | 74 g with battery |
| Battery | 21700 | 14500 |
| Max output | — | 600 lm |
| Throw | — | 186 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | $59.95 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 LD12R: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 121 mm (4.76 in), a difference of 18 mm (15%). At its widest point the Fenix LD12R is 6 mm slimmer (22 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Fenix LD12R: 74 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix LD12R is rated at 600 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 LD12R runs on a removable 14500 battery. For scale, a 21700 cell is about 21 × 70 mm and a 14500 about 14 × 50 mm (nominal).
Price
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Fenix LD12R $59.95 at fenixlighting.com, so the Emisar D4K cost $20.26 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 (18 mm shorter). Choose the Fenix LD12R if you want a slimmer profile (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 LD12R
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D4K vs LD12R FAQ
Which is smaller, the Emisar D4K or the Fenix LD12R?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 121 mm (4.76 in), a difference of 18 mm (15%). At its widest point the Fenix LD12R is 6 mm slimmer (22 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Fenix LD12R: 74 g with battery), so they are not directly comparable.
Which is cheaper, the Emisar D4K or the Fenix LD12R?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Fenix LD12R $59.95 at fenixlighting.com, so the Emisar D4K cost $20.26 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Fenix LD12R use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Fenix LD12R runs on a removable 14500 battery. For scale, a 21700 cell is about 21 × 70 mm and a 14500 about 14 × 50 mm (nominal).
Compare Emisar D4K with similar lights
Compare Fenix LD12R 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 LD12R: specs from Fenix product page (manufacturer). Price $59.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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