Emisar D1K vs Olight ArkTac Ultra size comparison
The Olight ArkTac Ultra is 21.6 mm (0.85 in) longer than the Emisar D1K, 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 Olight ArkTac Ultra is 21.6 mm (0.85 in) longer than the Emisar D1K, 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 D1K Check price ↗ | Olight ArkTac Ultra Check price ↗ | |
| Length | 114 mm (4.49 in) | 135.6 mm (5.34 in)+21.6 mm |
| Head / width | 35 mm (1.38 in) | 29 mm (1.14 in)−6 mm |
| Body | 26.5 mm (1.04 in) | — |
| Thickness | — | 17 mm (0.67 in) |
| Weight | 89 g without battery | 140 g with battery |
| Battery | 21700 | Built-in |
| Max output | 1,200 lm | — |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $39.95 at intl-outdoor.com, as of Nov 4, 2026 | $159.99 at olight.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Pocket thrower; lumens for SFT-25 | olight.com unverified Dims from ArkTac series comparison table (row assumed to be Ultra); re-check on ArkTac Ultra page |
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D1K vs ArkTac Ultra: how they differ
Size and weight
The Emisar D1K is the shorter light: 114 mm (4.49 in) against 135.6 mm (5.34 in), a difference of 21.6 mm (16%). At its widest point the Olight ArkTac Ultra is 6 mm slimmer (29 vs 35 mm). Weights are published on different bases (Emisar D1K: 89 g without battery; Olight ArkTac Ultra: 140 g with battery), so they are not directly comparable.
Brightness and throw
The Emisar D1K is rated at 1,200 lm; we have no published maximum for the Olight ArkTac Ultra.
Battery
The Emisar D1K runs on a removable 21700 battery; the Olight ArkTac Ultra runs on a built-in rechargeable battery. Only the Emisar D1K lets you swap in a charged spare.
Price
When we checked on Nov 4, 2026, the Emisar D1K was $39.95 at intl-outdoor.com and the Olight ArkTac Ultra $159.99 at olight.com, so the Emisar D1K cost $120.04 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 D1K if you want a shorter light (21.6 mm shorter) and a removable cell you can swap. Choose the Olight ArkTac Ultra if you want a slimmer profile (6 mm narrower) and 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 D1K Check price ↗ Olight ArkTac Ultra
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D1K vs ArkTac Ultra FAQ
Which is smaller, the Emisar D1K or the Olight ArkTac Ultra?
The Emisar D1K is the shorter light: 114 mm (4.49 in) against 135.6 mm (5.34 in), a difference of 21.6 mm (16%). At its widest point the Olight ArkTac Ultra is 6 mm slimmer (29 vs 35 mm). Weights are published on different bases (Emisar D1K: 89 g without battery; Olight ArkTac Ultra: 140 g with battery), so they are not directly comparable.
Which is cheaper, the Emisar D1K or the Olight ArkTac Ultra?
When we checked on Nov 4, 2026, the Emisar D1K was $39.95 at intl-outdoor.com and the Olight ArkTac Ultra $159.99 at olight.com, so the Emisar D1K cost $120.04 less. Prices change often, so check the current price before you buy.
Do the Emisar D1K and Olight ArkTac Ultra use the same battery?
The Emisar D1K runs on a removable 21700 battery; the Olight ArkTac Ultra runs on a built-in rechargeable battery. Only the Emisar D1K lets you swap in a charged spare.
Compare Emisar D1K with similar lights
Compare Olight ArkTac Ultra with similar lights
More
Sources
- Emisar D1K: specs from Emisar product page (manufacturer). Drawing: outline from published specs. Price $39.95 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
- Olight ArkTac Ultra: specs from Olight product page (manufacturer). Drawing: shape measured from manufacturer photo (olight.com), scaled to the published length and diameter. Some values could not be confirmed on a second source and are marked unverified. Price $159.99 from olight.com, checked Nov 4, 2026; prices change often.
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