Emisar D4K vs Olight Arkfeld Ultra size comparison
The Olight Arkfeld Ultra is 17 mm (0.67 in) longer than the Emisar D4K, and 1 mm narrower at its widest point. Weights are published on different bases (with battery vs without battery), so compare them with care.
Olight Arkfeld Ultra: Photo: Olight · Image policy
The Olight Arkfeld Ultra is 17 mm (0.67 in) longer than the Emisar D4K, and 1 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 ↗ | Olight Arkfeld Ultra Check price ↗ | |
| Length | 103 mm (4.06 in) | 120 mm (4.72 in)+17 mm |
| Head / width | 28 mm (1.10 in) | 27 mm (1.06 in)−1 mm |
| Body | 26.5 mm (1.04 in) | — |
| Thickness | — | 16 mm (0.63 in) |
| Weight | 58 g without battery | 119 g with battery |
| Battery | 21700 | Built-in |
| Max output | — | — |
| Throw | — | 103 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | $119.99 at olight.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Output depends on LED option | olight.com sourced Max output not shown in spec block |
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D4K vs Arkfeld Ultra: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 120 mm (4.72 in), a difference of 17 mm (14%). At its widest point the Olight Arkfeld Ultra is 1 mm slimmer (27 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight Arkfeld Ultra: 119 g with battery), so they are not directly comparable.
Brightness and throw
Output for the Emisar D4K depends on the LED option chosen.
Battery
The Emisar D4K runs on a removable 21700 battery; the Olight Arkfeld Ultra runs on a built-in rechargeable battery. Only the Emisar D4K lets you swap in a charged spare.
Price
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Olight Arkfeld Ultra $119.99 at olight.com, so the Emisar D4K cost $80.30 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog.
Which should you buy?
Choose the Emisar D4K if you want a shorter light (17 mm shorter) and a removable cell you can swap. Choose the Olight Arkfeld Ultra if you want a built-in battery with no separate cell to buy. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4K Check price ↗ Olight Arkfeld Ultra
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D4K vs Arkfeld Ultra FAQ
Which is smaller, the Emisar D4K or the Olight Arkfeld Ultra?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 120 mm (4.72 in), a difference of 17 mm (14%). At its widest point the Olight Arkfeld Ultra is 1 mm slimmer (27 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight Arkfeld Ultra: 119 g with battery), so they are not directly comparable.
Which is cheaper, the Emisar D4K or the Olight Arkfeld Ultra?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Olight Arkfeld Ultra $119.99 at olight.com, so the Emisar D4K cost $80.30 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Olight Arkfeld Ultra use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Olight Arkfeld Ultra runs on a built-in rechargeable battery. Only the Emisar D4K lets you swap in a charged spare.
Compare Emisar D4K with similar lights
Compare Olight Arkfeld Ultra with similar lights
More
Sources
- Emisar D4K: specs from Emisar product page (manufacturer). Drawing: outline from published specs. Price $39.69 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
- Olight Arkfeld Ultra: specs from Olight product page (manufacturer). Photo from manufacturer: the maker's own product photo with the background removed, scaled to the published length and diameter (Photo: Olight; image policy). Price $119.99 from olight.com, checked Nov 4, 2026; prices change often.
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