Emisar D4K vs Olight ArkPro size comparison
The Olight ArkPro is 21 mm (0.83 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.
The Olight ArkPro is 21 mm (0.83 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 ArkPro Check price ↗ | |
| Length | 103 mm (4.06 in) | 124 mm (4.88 in)+21 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 | 115 g with battery |
| Battery | 21700 | Built-in |
| Max output | — | 1,500 lm |
| Throw | — | 205 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | $109.99 at olight.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Output depends on LED option | olight.com sourced |
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D4K vs ArkPro: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 124 mm (4.88 in), a difference of 21 mm (17%). At its widest point the Olight ArkPro is 1 mm slimmer (27 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight ArkPro: 115 g with battery), so they are not directly comparable.
Brightness and throw
The Olight ArkPro is rated at 1,500 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 Olight ArkPro 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 ArkPro $109.99 at olight.com, so the Emisar D4K cost $70.30 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 (21 mm shorter) and a removable cell you can swap. Choose the Olight ArkPro 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 ArkPro
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D4K vs ArkPro FAQ
Which is smaller, the Emisar D4K or the Olight ArkPro?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 124 mm (4.88 in), a difference of 21 mm (17%). At its widest point the Olight ArkPro is 1 mm slimmer (27 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight ArkPro: 115 g with battery), so they are not directly comparable.
Which is cheaper, the Emisar D4K or the Olight ArkPro?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Olight ArkPro $109.99 at olight.com, so the Emisar D4K cost $70.30 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Olight ArkPro use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Olight ArkPro 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 ArkPro 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.
- Olight ArkPro: specs from Olight product page (manufacturer). Price $109.99 from olight.com, checked Nov 4, 2026; prices change often.
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