Emisar D4K vs Wurkkos TS21 size comparison
The Wurkkos TS21 is 10.4 mm (0.41 in) longer than the Emisar D4K, with about the same max diameter/width. It is 20 g heavier (without battery).
The Wurkkos TS21 is 10.4 mm (0.41 in) longer than the Emisar D4K, with about the same max diameter/width. It is 20 g heavier (without battery).
Dimensions
| Emisar D4K Check price ↗ | Wurkkos TS21 Check price ↗ | |
| Length | 103 mm (4.06 in) | 113.4 mm (4.46 in)+10.4 mm |
| Head / width | 28 mm (1.10 in) | 28 mm (1.10 in)same |
| Body | 26.5 mm (1.04 in) | — |
| Weight | 58 g without battery | 78 g without battery+20 g |
| Battery | 21700 | 21700 |
| Max output | — | 3,500 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | not verified yet |
| Source | intl-outdoor.com sourced Output depends on LED option | wurkkos.com sourced Only head diameter listed |
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D4K vs TS21: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 113.4 mm (4.46 in), a difference of 10.4 mm (9%). At their widest points they are about the same (28 vs 28 mm). The Emisar D4K is 20 g lighter (58 g vs 78 g, without battery).
Brightness and throw
The Wurkkos TS21 is rated at 3,500 lm; we have no published maximum for the Emisar D4K. Output for the Emisar D4K depends on the LED option chosen.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Emisar D4K if you want a shorter light (10.4 mm shorter) and less weight (20 g lighter). On the specs we track, the Emisar D4K is ahead or level everywhere; the Wurkkos TS21 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 ↗ Wurkkos TS21
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D4K vs TS21 FAQ
Which is smaller, the Emisar D4K or the Wurkkos TS21?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 113.4 mm (4.46 in), a difference of 10.4 mm (9%). At their widest points they are about the same (28 vs 28 mm). The Emisar D4K is 20 g lighter (58 g vs 78 g, without battery).
Do the Emisar D4K and Wurkkos TS21 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Emisar D4K with similar lights
Compare Wurkkos TS21 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.
- Wurkkos TS21: specs from Wurkkos product page (manufacturer). No verified price yet.
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