Acebeam Defender P16 vs Fenix TK21R size comparison
The Fenix TK21R is 28.5 mm (1.12 in) longer than the Acebeam Defender P16, and 4 mm wider at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
The Fenix TK21R is 28.5 mm (1.12 in) longer than the Acebeam Defender P16, and 4 mm wider at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
Dimensions
| Acebeam Defender P16 Check price ↗ | Fenix TK21R Check price ↗ | |
| Length | 131 mm (5.16 in) | 159.5 mm (6.28 in)+28.5 mm |
| Head / width | 32 mm (1.26 in) | 36 mm (1.42 in)+4 mm |
| Body | 23 mm (0.91 in) | 25.4 mm (1.00 in)+2.4 mm |
| Weight | 156 g listed | 221.4 g with battery |
| Battery | 18650 | One included 6000mAh rechargeable li-ion |
| Max output | 1,800 lm | 3,600 lm |
| Throw | 484 m | 480 m |
| Type | Tactical | Tactical |
| Price | $79.95 at batteryjunction.com, as of Nov 4, 2026 | $134.95 at fenixlighting.com, as of Nov 4, 2026 |
| Source | batteryjunction.com sourced | fenixlighting.com sourced |
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Defender P16 vs TK21R: how they differ
Size and weight
The Acebeam Defender P16 is the shorter light: 131 mm (5.16 in) against 159.5 mm (6.28 in), a difference of 28.5 mm (18%). At its widest point the Acebeam Defender P16 is 4 mm slimmer (32 vs 36 mm). Weights are published on different bases (Acebeam Defender P16: 156 g listed; Fenix TK21R: 221.4 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 1,800 lm for the Acebeam Defender P16, 100% more. For beam distance the Acebeam Defender P16 reaches further: 484 m vs 480 m rated throw (1% more).
Battery
The Acebeam Defender P16 runs on a removable 18650 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Price
When we checked on Nov 4, 2026, the Acebeam Defender P16 was $79.95 at batteryjunction.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Acebeam Defender P16 cost $55.00 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 Acebeam Defender P16 if you want a shorter light (28.5 mm shorter) and a slimmer profile (4 mm narrower). Choose the Fenix TK21R if you want more output (3,600 lm vs 1,800 lm). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Acebeam Defender P16 Check price ↗ Fenix TK21R
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Defender P16 vs TK21R FAQ
Which is smaller, the Acebeam Defender P16 or the Fenix TK21R?
The Acebeam Defender P16 is the shorter light: 131 mm (5.16 in) against 159.5 mm (6.28 in), a difference of 28.5 mm (18%). At its widest point the Acebeam Defender P16 is 4 mm slimmer (32 vs 36 mm). Weights are published on different bases (Acebeam Defender P16: 156 g listed; Fenix TK21R: 221.4 g with battery), so they are not directly comparable.
Which is brighter, the Acebeam Defender P16 or the Fenix TK21R?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 1,800 lm for the Acebeam Defender P16, 100% more. For beam distance the Acebeam Defender P16 reaches further: 484 m vs 480 m rated throw (1% more).
Which is cheaper, the Acebeam Defender P16 or the Fenix TK21R?
When we checked on Nov 4, 2026, the Acebeam Defender P16 was $79.95 at batteryjunction.com and the Fenix TK21R $134.95 at fenixlighting.com, so the Acebeam Defender P16 cost $55.00 less. Prices change often, so check the current price before you buy.
Do the Acebeam Defender P16 and Fenix TK21R use the same battery?
The Acebeam Defender P16 runs on a removable 18650 battery; the Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion).
Compare Acebeam Defender P16 with similar lights
Compare Fenix TK21R with similar lights
More
Sources
- Acebeam Defender P16: specs from manufacturer published specs as listed by batteryjunction.com. Price $79.95 from batteryjunction.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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