Fenix LD45R vs Fenix TK21R size comparison
The Fenix TK21R is 4.2 mm (0.17 in) longer than the Fenix LD45R, and 8.5 mm narrower at its widest point. It is 81 g lighter (with battery).
The Fenix TK21R is 4.2 mm (0.17 in) longer than the Fenix LD45R, and 8.5 mm narrower at its widest point. It is 81 g lighter (with battery).
Dimensions
| Fenix LD45R Check price ↗ | Fenix TK21R Check price ↗ | |
| Length | 155.3 mm (6.11 in) | 159.5 mm (6.28 in)+4.2 mm |
| Head / width | 44.5 mm (1.75 in) | 36 mm (1.42 in)−8.5 mm |
| Body | 32 mm (1.26 in) | 25.4 mm (1.00 in)−6.6 mm |
| Weight | 302 g with battery | 221.4 g with battery−81 g |
| Battery | 21700 | One included 6000mAh rechargeable li-ion |
| Max output | 2,800 lm | 3,600 lm |
| Throw | 480 m | 480 m |
| Type | Tactical | Tactical |
| Price | $159.95 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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LD45R vs TK21R: how they differ
Size and weight
The Fenix LD45R is the shorter light: 155.3 mm (6.11 in) against 159.5 mm (6.28 in), a difference of 4.2 mm (3%). At its widest point the Fenix TK21R is 8.5 mm slimmer (36 vs 44.5 mm). The Fenix TK21R is 81 g lighter (221.4 g vs 302 g, with battery).
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,800 lm for the Fenix LD45R, 29% more. Rated throw is the same, 480 m.
Battery
The Fenix LD45R 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 LD45R was $159.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK21R cost $25.00 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 LD45R if you want a shorter light (4.2 mm shorter). Choose the Fenix TK21R if you want a slimmer profile (8.5 mm narrower), less weight (81 g lighter) and 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 LD45R Check price ↗ Fenix TK21R
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LD45R vs TK21R FAQ
Which is smaller, the Fenix LD45R or the Fenix TK21R?
The Fenix LD45R is the shorter light: 155.3 mm (6.11 in) against 159.5 mm (6.28 in), a difference of 4.2 mm (3%). At its widest point the Fenix TK21R is 8.5 mm slimmer (36 vs 44.5 mm). The Fenix TK21R is 81 g lighter (221.4 g vs 302 g, with battery).
Which is brighter, the Fenix LD45R or the Fenix TK21R?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,800 lm for the Fenix LD45R, 29% more. Rated throw is the same, 480 m.
Which is cheaper, the Fenix LD45R or the Fenix TK21R?
When we checked on Nov 4, 2026, the Fenix LD45R was $159.95 at fenixlighting.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Fenix TK21R cost $25.00 less. Prices change often, so check the current price before you buy.
Do the Fenix LD45R and Fenix TK21R use the same battery?
The Fenix LD45R runs on a removable 21700 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Compare Fenix LD45R with similar lights
Compare Fenix TK21R with similar lights
More
Sources
- Fenix LD45R: specs from Fenix product page (manufacturer). Price $159.95 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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