Emisar D4K vs Sofirn SC18 size comparison
The Sofirn SC18 is 1.5 mm (0.06 in) shorter than the Emisar D4K, and 3.3 mm narrower at its widest point. It is 3 g lighter (without battery).
The Sofirn SC18 is 1.5 mm (0.06 in) shorter than the Emisar D4K, and 3.3 mm narrower at its widest point. It is 3 g lighter (without battery).
Dimensions
| Emisar D4K Check price ↗ | Sofirn SC18 Check price ↗ | |
| Length | 103 mm (4.06 in) | 101.5 mm (4.00 in)−1.5 mm |
| Head / width | 28 mm (1.10 in) | 24.7 mm (0.97 in)−3.3 mm |
| Body | 26.5 mm (1.04 in) | — |
| Weight | 58 g without battery | 55 g without battery−3 g |
| Battery | 21700 | 18650 |
| Max output | — | — |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | from $19.99 at flashlightgo.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Output depends on LED option | flashlightgo.com sourced Only head diameter listed |
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D4K vs SC18: how they differ
Size and weight
The Sofirn SC18 is the shorter light: 101.5 mm (4.00 in) against 103 mm (4.06 in), a difference of 1.5 mm (1%). At its widest point the Sofirn SC18 is 3.3 mm slimmer (24.7 vs 28 mm). The Sofirn SC18 is 3 g lighter (55 g vs 58 g, without battery).
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 Sofirn SC18 runs on a removable 18650 battery. 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 Sofirn SC18 from $19.99 at flashlightgo.com, so the Sofirn SC18 cost $19.70 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 Sofirn SC18 if you want a slimmer profile (3.3 mm narrower). On the specs we track, the Sofirn SC18 is ahead or level everywhere; the Emisar D4K makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4K Check price ↗ Sofirn SC18
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D4K vs SC18 FAQ
Which is smaller, the Emisar D4K or the Sofirn SC18?
The Sofirn SC18 is the shorter light: 101.5 mm (4.00 in) against 103 mm (4.06 in), a difference of 1.5 mm (1%). At its widest point the Sofirn SC18 is 3.3 mm slimmer (24.7 vs 28 mm). The Sofirn SC18 is 3 g lighter (55 g vs 58 g, without battery).
Which is cheaper, the Emisar D4K or the Sofirn SC18?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Sofirn SC18 from $19.99 at flashlightgo.com, so the Sofirn SC18 cost $19.70 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Sofirn SC18 use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Sofirn SC18 runs on a removable 18650 battery. 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 Sofirn SC18 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.
- Sofirn SC18: specs from manufacturer published specs as listed by flashlightgo.com. Price from $19.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
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