Emisar D1K vs Sofirn SC31 Pro size comparison
The Sofirn SC31 Pro is 3.5 mm (0.14 in) longer than the Emisar D1K, and 9.6 mm narrower at its widest point. It is 30 g lighter (without battery).
The Sofirn SC31 Pro is 3.5 mm (0.14 in) longer than the Emisar D1K, and 9.6 mm narrower at its widest point. It is 30 g lighter (without battery).
Dimensions
| Emisar D1K Check price ↗ | Sofirn SC31 Pro Check price ↗ | |
| Length | 114 mm (4.49 in) | 117.5 mm (4.63 in)+3.5 mm |
| Head / width | 35 mm (1.38 in) | 25.4 mm (1.00 in)−9.6 mm |
| Body | 26.5 mm (1.04 in) | — |
| Weight | 89 g without battery | 59 g without battery−30 g |
| Battery | 21700 | 18650 |
| Max output | 1,200 lm | 2,000 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $39.95 at intl-outdoor.com, as of Nov 4, 2026 | not verified yet |
| Source | intl-outdoor.com sourced Pocket thrower; lumens for SFT-25 | sofirnlight.com sourced Only head diameter listed |
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D1K vs SC31 Pro: how they differ
Size and weight
The Emisar D1K is the shorter light: 114 mm (4.49 in) against 117.5 mm (4.63 in), a difference of 3.5 mm (3%). At its widest point the Sofirn SC31 Pro is 9.6 mm slimmer (25.4 vs 35 mm). The Sofirn SC31 Pro is 30 g lighter (59 g vs 89 g, without battery).
Brightness and throw
The Sofirn SC31 Pro is rated brighter: 2,000 lm maximum vs 1,200 lm for the Emisar D1K, 67% more.
Battery
The Emisar D1K runs on a removable 21700 battery; the Sofirn SC31 Pro runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Emisar D1K if you want a shorter light (3.5 mm shorter). Choose the Sofirn SC31 Pro if you want a slimmer profile (9.6 mm narrower), less weight (30 g lighter) and more output (2,000 lm vs 1,200 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D1K Check price ↗ Sofirn SC31 Pro
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D1K vs SC31 Pro FAQ
Which is smaller, the Emisar D1K or the Sofirn SC31 Pro?
The Emisar D1K is the shorter light: 114 mm (4.49 in) against 117.5 mm (4.63 in), a difference of 3.5 mm (3%). At its widest point the Sofirn SC31 Pro is 9.6 mm slimmer (25.4 vs 35 mm). The Sofirn SC31 Pro is 30 g lighter (59 g vs 89 g, without battery).
Which is brighter, the Emisar D1K or the Sofirn SC31 Pro?
The Sofirn SC31 Pro is rated brighter: 2,000 lm maximum vs 1,200 lm for the Emisar D1K, 67% more.
Do the Emisar D1K and Sofirn SC31 Pro use the same battery?
The Emisar D1K runs on a removable 21700 battery; the Sofirn SC31 Pro 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 D1K with similar lights
Compare Sofirn SC31 Pro with similar lights
More
Sources
- Emisar D1K: specs from Emisar product page (manufacturer). Price $39.95 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
- Sofirn SC31 Pro: specs from manufacturer published specs as listed by sofirnlight.com. No verified price yet.
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