Fenix HM75R PRO vs Olight Perun 3 size comparison
The Olight Perun 3 is 19.2 mm (0.76 in) longer than the Fenix HM75R PRO, and 33.9 mm narrower at its widest point. Weights are published on different bases (listed vs with battery and headband), so compare them with care.
The Olight Perun 3 is 19.2 mm (0.76 in) longer than the Fenix HM75R PRO, and 33.9 mm narrower at its widest point. Weights are published on different bases (listed vs with battery and headband), so compare them with care.
Dimensions
| Fenix HM75R PRO Check price ↗ | Olight Perun 3 Check price ↗ | |
| Length | 97.8 mm (3.85 in) | 117 mm (4.61 in)+19.2 mm |
| Head / width | 61.9 mm (2.44 in) | 28 mm (1.10 in)−33.9 mm |
| Body | — | 28 mm (1.10 in) |
| Thickness | 50.4 mm (1.98 in) | — |
| Weight | 214 g with battery and headband | 150 g listed |
| Battery | 21700 | 21700 |
| Max output | 3,500 lm | 3,000 lm |
| Throw | 398 m | 160 m |
| Type | Headlamp / right-angle | Headlamp / right-angle |
| Price | $139.95 at fenixlighting.com, as of Nov 4, 2026 | $89.99 at olight.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced Headlamp unit; front view drawn width x height | batteryjunction.com sourced |
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HM75R PRO vs Perun 3: how they differ
Size and weight
The Fenix HM75R PRO is the shorter light: 97.8 mm (3.85 in) against 117 mm (4.61 in), a difference of 19.2 mm (16%). At its widest point the Olight Perun 3 is 33.9 mm slimmer (28 vs 61.9 mm). Weights are published on different bases (Fenix HM75R PRO: 214 g with battery and headband; Olight Perun 3: 150 g listed), so they are not directly comparable.
Brightness and throw
The Fenix HM75R PRO is rated brighter: 3,500 lm maximum vs 3,000 lm for the Olight Perun 3, 17% more. For beam distance the Fenix HM75R PRO reaches further: 398 m vs 160 m rated throw (149% more).
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Fenix HM75R PRO was $139.95 at fenixlighting.com and the Olight Perun 3 $89.99 at olight.com, so the Olight Perun 3 cost $49.96 less. Prices change often, so check the current price before you buy.
Type
Both are headlamps / right-angle lights in our catalog.
Which should you buy?
Choose the Fenix HM75R PRO if you want a shorter light (19.2 mm shorter), more output (3,500 lm vs 3,000 lm) and longer throw (398 m vs 160 m). Choose the Olight Perun 3 if you want a slimmer profile (33.9 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix HM75R PRO Check price ↗ Olight Perun 3
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
HM75R PRO vs Perun 3 FAQ
Which is smaller, the Fenix HM75R PRO or the Olight Perun 3?
The Fenix HM75R PRO is the shorter light: 97.8 mm (3.85 in) against 117 mm (4.61 in), a difference of 19.2 mm (16%). At its widest point the Olight Perun 3 is 33.9 mm slimmer (28 vs 61.9 mm). Weights are published on different bases (Fenix HM75R PRO: 214 g with battery and headband; Olight Perun 3: 150 g listed), so they are not directly comparable.
Which is brighter, the Fenix HM75R PRO or the Olight Perun 3?
The Fenix HM75R PRO is rated brighter: 3,500 lm maximum vs 3,000 lm for the Olight Perun 3, 17% more. For beam distance the Fenix HM75R PRO reaches further: 398 m vs 160 m rated throw (149% more).
Which is cheaper, the Fenix HM75R PRO or the Olight Perun 3?
When we checked on Nov 4, 2026, the Fenix HM75R PRO was $139.95 at fenixlighting.com and the Olight Perun 3 $89.99 at olight.com, so the Olight Perun 3 cost $49.96 less. Prices change often, so check the current price before you buy.
Do the Fenix HM75R PRO and Olight Perun 3 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Fenix HM75R PRO with similar lights
Compare Olight Perun 3 with similar lights
More
Sources
- Fenix HM75R PRO: specs from Fenix product page (manufacturer). Price $139.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Olight Perun 3: specs from Olight product page (manufacturer); manufacturer published specs as listed by batteryjunction.com. Price $89.99 from olight.com, checked Nov 4, 2026; prices change often.
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