Klarus XT21C vs Streamlight ProTac HL-X size comparison
The Streamlight ProTac HL-X is 9 mm (0.35 in) shorter than the Klarus XT21C, and 2 mm wider at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
The Streamlight ProTac HL-X is 9 mm (0.35 in) shorter than the Klarus XT21C, and 2 mm wider at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
Dimensions
| Klarus XT21C Check price ↗ | Streamlight ProTac HL-X Check price ↗ | |
| Length | 147 mm (5.79 in) | 138 mm (5.43 in)−9 mm |
| Head / width | 35 mm (1.38 in) | 37 mm (1.46 in)+2 mm |
| Body | 25 mm (0.98 in) | 25 mm (0.98 in)same |
| Weight | 110 g listed | 162 g listed |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 3,000 lm | 1,000 lm |
| Throw | 324 m | 330 m |
| Type | Tactical | Tactical |
| Price | $104.95 at batteryjunction.com, as of Nov 4, 2026 | from $112.15 at batteryjunction.com, as of Nov 4, 2026 |
| Source | batteryjunction.com sourced | batteryjunction.com sourced |
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XT21C vs ProTac HL-X: how they differ
Size and weight
The Streamlight ProTac HL-X is the shorter light: 138 mm (5.43 in) against 147 mm (5.79 in), a difference of 9 mm (6%). At its widest point the Klarus XT21C is 2 mm slimmer (35 vs 37 mm). Weights are published on different bases (Klarus XT21C: 110 g listed; Streamlight ProTac HL-X: 162 g listed), so they are not directly comparable.
Brightness and throw
The Klarus XT21C is rated brighter: 3,000 lm maximum vs 1,000 lm for the Streamlight ProTac HL-X, 200% more. For beam distance the Streamlight ProTac HL-X reaches further: 330 m vs 324 m rated throw (2% more).
Battery
The Klarus XT21C runs on a removable 21700 battery; the Streamlight ProTac HL-X runs on removable 18650 / 2x CR123A batteries. 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 Klarus XT21C was $104.95 at batteryjunction.com and the Streamlight ProTac HL-X from $112.15 at batteryjunction.com, so the Klarus XT21C cost $7.20 less. Prices change often, so check the current price before you buy.
Type
Both are tactical lights in our catalog with a tube body.
Which should you buy?
Choose the Klarus XT21C if you want a slimmer profile (2 mm narrower) and more output (3,000 lm vs 1,000 lm). Choose the Streamlight ProTac HL-X if you want a shorter light (9 mm shorter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Klarus XT21C Check price ↗ Streamlight ProTac HL-X
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
XT21C vs ProTac HL-X FAQ
Which is smaller, the Klarus XT21C or the Streamlight ProTac HL-X?
The Streamlight ProTac HL-X is the shorter light: 138 mm (5.43 in) against 147 mm (5.79 in), a difference of 9 mm (6%). At its widest point the Klarus XT21C is 2 mm slimmer (35 vs 37 mm). Weights are published on different bases (Klarus XT21C: 110 g listed; Streamlight ProTac HL-X: 162 g listed), so they are not directly comparable.
Which is brighter, the Klarus XT21C or the Streamlight ProTac HL-X?
The Klarus XT21C is rated brighter: 3,000 lm maximum vs 1,000 lm for the Streamlight ProTac HL-X, 200% more. For beam distance the Streamlight ProTac HL-X reaches further: 330 m vs 324 m rated throw (2% more).
Which is cheaper, the Klarus XT21C or the Streamlight ProTac HL-X?
When we checked on Nov 4, 2026, the Klarus XT21C was $104.95 at batteryjunction.com and the Streamlight ProTac HL-X from $112.15 at batteryjunction.com, so the Klarus XT21C cost $7.20 less. Prices change often, so check the current price before you buy.
Do the Klarus XT21C and Streamlight ProTac HL-X use the same battery?
The Klarus XT21C runs on a removable 21700 battery; the Streamlight ProTac HL-X runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Klarus XT21C with similar lights
Compare Streamlight ProTac HL-X with similar lights
More
Sources
- Klarus XT21C: specs from manufacturer published specs as listed by batteryjunction.com. Price $104.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
- Streamlight ProTac HL-X: specs from manufacturer published specs as listed by batteryjunction.com. Price from $112.15 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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