Fenix TK20R UE vs Fenix TK21R size comparison
The Fenix TK21R is 5.8 mm (0.23 in) longer than the Fenix TK20R UE, and 2 mm wider at its widest point. It is 17 g heavier (with battery).
The Fenix TK21R is 5.8 mm (0.23 in) longer than the Fenix TK20R UE, and 2 mm wider at its widest point. It is 17 g heavier (with battery).
Dimensions
| Fenix TK20R UE Check price ↗ | Fenix TK21R Check price ↗ | |
| Length | 153.7 mm (6.05 in) | 159.5 mm (6.28 in)+5.8 mm |
| Head / width | 34 mm (1.34 in) | 36 mm (1.42 in)+2 mm |
| Body | 25.4 mm (1.00 in) | 25.4 mm (1.00 in)same |
| Weight | 204 g with battery | 221.4 g with battery+17 g |
| Battery | 21700 | One included 6000mAh rechargeable li-ion |
| Max output | 2,800 lm | 3,600 lm |
| Throw | 465 m | 480 m |
| Type | Tactical | Tactical |
| Price | $89.95 at fenixlighting.com, as of Nov 4, 2026 | $134.95 at fenixlighting.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | fenixlighting.com sourced |
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TK20R UE vs TK21R: how they differ
Size and weight
The Fenix TK20R UE is the shorter light: 153.7 mm (6.05 in) against 159.5 mm (6.28 in), a difference of 5.8 mm (4%). At its widest point the Fenix TK20R UE is 2 mm slimmer (34 vs 36 mm). The Fenix TK20R UE is 17 g lighter (204 g vs 221.4 g, with battery).
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,800 lm for the Fenix TK20R UE, 29% more. For beam distance the Fenix TK21R reaches further: 480 m vs 465 m rated throw (3% more).
Battery
The Fenix TK20R UE runs on a removable 21700 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Price
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK20R UE cost $45.00 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 a shorter light (5.8 mm shorter), a slimmer profile (2 mm narrower) and less weight (17 g lighter). Choose the Fenix TK21R if you want more output (3,600 lm vs 2,800 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK20R UE Check price ↗ Fenix TK21R
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TK20R UE vs TK21R FAQ
Which is smaller, the Fenix TK20R UE or the Fenix TK21R?
The Fenix TK20R UE is the shorter light: 153.7 mm (6.05 in) against 159.5 mm (6.28 in), a difference of 5.8 mm (4%). At its widest point the Fenix TK20R UE is 2 mm slimmer (34 vs 36 mm). The Fenix TK20R UE is 17 g lighter (204 g vs 221.4 g, with battery).
Which is brighter, the Fenix TK20R UE or the Fenix TK21R?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,800 lm for the Fenix TK20R UE, 29% more. For beam distance the Fenix TK21R reaches further: 480 m vs 465 m rated throw (3% more).
Which is cheaper, the Fenix TK20R UE or the Fenix TK21R?
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK20R UE cost $45.00 less. Prices change often, so check the current price before you buy.
Do the Fenix TK20R UE and Fenix TK21R use the same battery?
The Fenix TK20R UE runs on a removable 21700 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Compare Fenix TK20R UE with similar lights
Compare Fenix TK21R 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.
- Fenix TK21R: specs from Fenix product page (manufacturer). Drawing: shape measured from manufacturer photo (nealsgadgets.com), scaled to the published length and diameter. Price $134.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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