Fenix TK15R vs Fenix TK21R size comparison
The Fenix TK21R is 10.5 mm (0.41 in) longer than the Fenix TK15R, and 2 mm wider at its widest point. It is 16 g heavier (with battery).
The Fenix TK21R is 10.5 mm (0.41 in) longer than the Fenix TK15R, and 2 mm wider at its widest point. It is 16 g heavier (with battery).
Dimensions
| Fenix TK15R Check price ↗ | Fenix TK21R Check price ↗ | |
| Length | 149 mm (5.87 in) | 159.5 mm (6.28 in)+10.5 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 | 205.5 g with battery | 221.4 g with battery+16 g |
| Battery | 21700 | One included 6000mAh rechargeable li-ion |
| Max output | 3,200 lm | 3,600 lm |
| Throw | 490 m | 480 m |
| Type | Tactical | Tactical |
| Price | $119.95 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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TK15R vs TK21R: how they differ
Size and weight
The Fenix TK15R is the shorter light: 149 mm (5.87 in) against 159.5 mm (6.28 in), a difference of 10.5 mm (7%). At its widest point the Fenix TK15R is 2 mm slimmer (34 vs 36 mm). The Fenix TK15R is 16 g lighter (205.5 g vs 221.4 g, with battery).
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 3,200 lm for the Fenix TK15R, 13% more. For beam distance the Fenix TK15R reaches further: 490 m vs 480 m rated throw (2% more).
Battery
The Fenix TK15R 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 TK15R was $119.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK15R 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 TK15R if you want a shorter light (10.5 mm shorter), a slimmer profile (2 mm narrower) and less weight (16 g lighter). Choose the Fenix TK21R if you want more output (3,600 lm vs 3,200 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK15R Check price ↗ Fenix TK21R
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
TK15R vs TK21R FAQ
Which is smaller, the Fenix TK15R or the Fenix TK21R?
The Fenix TK15R is the shorter light: 149 mm (5.87 in) against 159.5 mm (6.28 in), a difference of 10.5 mm (7%). At its widest point the Fenix TK15R is 2 mm slimmer (34 vs 36 mm). The Fenix TK15R is 16 g lighter (205.5 g vs 221.4 g, with battery).
Which is brighter, the Fenix TK15R or the Fenix TK21R?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 3,200 lm for the Fenix TK15R, 13% more. For beam distance the Fenix TK15R reaches further: 490 m vs 480 m rated throw (2% more).
Which is cheaper, the Fenix TK15R or the Fenix TK21R?
When we checked on Nov 4, 2026, the Fenix TK15R was $119.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK15R cost $15.00 less. Prices change often, so check the current price before you buy.
Do the Fenix TK15R and Fenix TK21R use the same battery?
The Fenix TK15R runs on a removable 21700 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Compare Fenix TK15R with similar lights
Compare Fenix TK21R with similar lights
More
Sources
- Fenix TK15R: specs from Fenix product page (manufacturer). Price $119.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Fenix TK21R: specs from Fenix product page (manufacturer). Price $134.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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