Fenix TK20R UE vs ThruNite BSS V6 size comparison
The ThruNite BSS V6 is 7.7 mm (0.30 in) shorter than the Fenix TK20R UE, and 9 mm narrower at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
The ThruNite BSS V6 is 7.7 mm (0.30 in) shorter than the Fenix TK20R UE, and 9 mm narrower 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 ↗ | ThruNite BSS V6 Check price ↗ | |
| Length | 153.7 mm (6.05 in) | 146 mm (5.75 in)−7.7 mm |
| Head / width | 34 mm (1.34 in) | 25 mm (0.98 in)−9 mm |
| Body | 25.4 mm (1.00 in) | 24 mm (0.94 in)−1.4 mm |
| Weight | 204 g with battery | 97 g listed |
| Battery | 21700 | 18650 |
| Max output | 2,800 lm | 2,000 lm |
| Throw | 465 m | 259 m |
| Type | Tactical | Tactical |
| Price | $89.95 at fenixlighting.com, as of Nov 4, 2026 | $49.99 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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TK20R UE vs BSS V6: how they differ
Size and weight
The ThruNite BSS V6 is the shorter light: 146 mm (5.75 in) against 153.7 mm (6.05 in), a difference of 7.7 mm (5%). At its widest point the ThruNite BSS V6 is 9 mm slimmer (25 vs 34 mm). Weights are published on different bases (Fenix TK20R UE: 204 g with battery; ThruNite BSS V6: 97 g listed), so they are not directly comparable.
Brightness and throw
The Fenix TK20R UE is rated brighter: 2,800 lm maximum vs 2,000 lm for the ThruNite BSS V6, 40% more. For beam distance the Fenix TK20R UE reaches further: 465 m vs 259 m rated throw (80% more).
Battery
The Fenix TK20R UE runs on a removable 21700 battery; the ThruNite BSS V6 runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the ThruNite BSS V6 $49.99 at batteryjunction.com, so the ThruNite BSS V6 cost $39.96 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 more output (2,800 lm vs 2,000 lm) and longer throw (465 m vs 259 m). Choose the ThruNite BSS V6 if you want a shorter light (7.7 mm shorter) and a slimmer profile (9 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK20R UE Check price ↗ ThruNite BSS V6
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
TK20R UE vs BSS V6 FAQ
Which is smaller, the Fenix TK20R UE or the ThruNite BSS V6?
The ThruNite BSS V6 is the shorter light: 146 mm (5.75 in) against 153.7 mm (6.05 in), a difference of 7.7 mm (5%). At its widest point the ThruNite BSS V6 is 9 mm slimmer (25 vs 34 mm). Weights are published on different bases (Fenix TK20R UE: 204 g with battery; ThruNite BSS V6: 97 g listed), so they are not directly comparable.
Which is brighter, the Fenix TK20R UE or the ThruNite BSS V6?
The Fenix TK20R UE is rated brighter: 2,800 lm maximum vs 2,000 lm for the ThruNite BSS V6, 40% more. For beam distance the Fenix TK20R UE reaches further: 465 m vs 259 m rated throw (80% more).
Which is cheaper, the Fenix TK20R UE or the ThruNite BSS V6?
When we checked on Nov 4, 2026, the Fenix TK20R UE was $89.95 at fenixlighting.com and the ThruNite BSS V6 $49.99 at batteryjunction.com, so the ThruNite BSS V6 cost $39.96 less. Prices change often, so check the current price before you buy.
Do the Fenix TK20R UE and ThruNite BSS V6 use the same battery?
The Fenix TK20R UE runs on a removable 21700 battery; the ThruNite BSS V6 runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Fenix TK20R UE with similar lights
Compare ThruNite BSS V6 with similar lights
More
Sources
- Fenix TK20R UE: specs from Fenix product page (manufacturer). Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- ThruNite BSS V6: specs from manufacturer published specs as listed by batteryjunction.com. Price $49.99 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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