Fenix TK20R UE vs Klarus XT21C size comparison
The Klarus XT21C is 6.7 mm (0.26 in) shorter than the Fenix TK20R UE, and 1 mm wider at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
The Klarus XT21C is 6.7 mm (0.26 in) shorter than the Fenix TK20R UE, and 1 mm wider at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
Dimensions
| Fenix TK20R UE Check price ↗ | Klarus XT21C Check price ↗ | |
| Length | 153.7 mm (6.05 in) | 147 mm (5.79 in)−6.7 mm |
| Head / width | 34 mm (1.34 in) | 35 mm (1.38 in)+1 mm |
| Body | 25.4 mm (1.00 in) | 25 mm (0.98 in)−0.4 mm |
| Weight | 204 g with battery | 110 g listed |
| Battery | 21700 | 21700 |
| Max output | 2,800 lm | 3,000 lm |
| Throw | 465 m | 324 m |
| Type | Tactical | Tactical |
| Price | $89.95 at fenixlighting.com, as of Nov 4, 2026 | $104.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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TK20R UE vs XT21C: how they differ
Size and weight
The Klarus XT21C is the shorter light: 147 mm (5.79 in) against 153.7 mm (6.05 in), a difference of 6.7 mm (4%). At its widest point the Fenix TK20R UE is 1 mm slimmer (34 vs 35 mm). Weights are published on different bases (Fenix TK20R UE: 204 g with battery; Klarus XT21C: 110 g listed), so they are not directly comparable.
Brightness and throw
The Klarus XT21C is rated brighter: 3,000 lm maximum vs 2,800 lm for the Fenix TK20R UE, 7% more. For beam distance the Fenix TK20R UE reaches further: 465 m vs 324 m rated throw (44% more).
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the Klarus XT21C $104.95 at batteryjunction.com, so the Fenix TK20R UE cost $15.00 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 Fenix TK20R UE if you want longer throw (465 m vs 324 m). Choose the Klarus XT21C if you want a shorter light (6.7 mm shorter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK20R UE Check price ↗ Klarus XT21C
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
TK20R UE vs XT21C FAQ
Which is smaller, the Fenix TK20R UE or the Klarus XT21C?
The Klarus XT21C is the shorter light: 147 mm (5.79 in) against 153.7 mm (6.05 in), a difference of 6.7 mm (4%). At its widest point the Fenix TK20R UE is 1 mm slimmer (34 vs 35 mm). Weights are published on different bases (Fenix TK20R UE: 204 g with battery; Klarus XT21C: 110 g listed), so they are not directly comparable.
Which is brighter, the Fenix TK20R UE or the Klarus XT21C?
The Klarus XT21C is rated brighter: 3,000 lm maximum vs 2,800 lm for the Fenix TK20R UE, 7% more. For beam distance the Fenix TK20R UE reaches further: 465 m vs 324 m rated throw (44% more).
Which is cheaper, the Fenix TK20R UE or the Klarus XT21C?
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the Klarus XT21C $104.95 at batteryjunction.com, so the Fenix TK20R UE cost $15.00 less. Prices change often, so check the current price before you buy.
Do the Fenix TK20R UE and Klarus XT21C use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Fenix TK20R UE with similar lights
Compare Klarus XT21C with similar lights
More
Sources
- Fenix TK20R UE: specs from Fenix product page (manufacturer). Drawing: outline from published specs. Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Klarus XT21C: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $104.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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