Emisar D4K vs Streamlight ProTac 1L-1AA size comparison
The Streamlight ProTac 1L-1AA is 5 mm (0.20 in) longer than the Emisar D4K, and 4 mm narrower at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
The Streamlight ProTac 1L-1AA is 5 mm (0.20 in) longer than the Emisar D4K, and 4 mm narrower at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
Dimensions
| Emisar D4K Check price ↗ | Streamlight ProTac 1L-1AA Check price ↗ | |
| Length | 103 mm (4.06 in) | 108 mm (4.25 in)+5 mm |
| Head / width | 28 mm (1.10 in) | 24 mm (0.94 in)−4 mm |
| Body | 26.5 mm (1.04 in) | 22 mm (0.87 in)−4.5 mm |
| Weight | 58 g without battery | 71 g listed |
| Battery | 21700 | CR123A / AA |
| Max output | — | 350 lm |
| Throw | — | 105 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | $56.45 at batteryjunction.com, as of Nov 4, 2026 |
| Source | intl-outdoor.com sourced Output depends on LED option | batteryjunction.com sourced |
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D4K vs ProTac 1L-1AA: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 108 mm (4.25 in), a difference of 5 mm (5%). At its widest point the Streamlight ProTac 1L-1AA is 4 mm slimmer (24 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Streamlight ProTac 1L-1AA: 71 g listed), so they are not directly comparable.
Brightness and throw
The Streamlight ProTac 1L-1AA is rated at 350 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 Streamlight ProTac 1L-1AA runs on removable CR123A / AA batteries. For scale, a 21700 cell is about 21 × 70 mm and a CR123A about 17 × 34.5 mm (nominal).
Price
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Streamlight ProTac 1L-1AA $56.45 at batteryjunction.com, so the Emisar D4K cost $16.76 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 Emisar D4K if you want a shorter light (5 mm shorter). Choose the Streamlight ProTac 1L-1AA if you want a slimmer profile (4 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4K Check price ↗ Streamlight ProTac 1L-1AA
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
D4K vs ProTac 1L-1AA FAQ
Which is smaller, the Emisar D4K or the Streamlight ProTac 1L-1AA?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 108 mm (4.25 in), a difference of 5 mm (5%). At its widest point the Streamlight ProTac 1L-1AA is 4 mm slimmer (24 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Streamlight ProTac 1L-1AA: 71 g listed), so they are not directly comparable.
Which is cheaper, the Emisar D4K or the Streamlight ProTac 1L-1AA?
When we checked on Nov 4, 2026, the Emisar D4K was $39.69 at intl-outdoor.com and the Streamlight ProTac 1L-1AA $56.45 at batteryjunction.com, so the Emisar D4K cost $16.76 less. Prices change often, so check the current price before you buy.
Do the Emisar D4K and Streamlight ProTac 1L-1AA use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Streamlight ProTac 1L-1AA runs on removable CR123A / AA batteries. For scale, a 21700 cell is about 21 × 70 mm and a CR123A about 17 × 34.5 mm (nominal).
Compare Emisar D4K with similar lights
Compare Streamlight ProTac 1L-1AA 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.
- Streamlight ProTac 1L-1AA: specs from manufacturer published specs as listed by batteryjunction.com. Price $56.45 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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