Fenix E12 V3.0 vs Olight i3T EOS size comparison
The Olight i3T EOS is 7.5 mm (0.30 in) longer than the Fenix E12 V3.0, and 4.3 mm narrower at its widest point. It is 13 g lighter (with battery).
The Olight i3T EOS is 7.5 mm (0.30 in) longer than the Fenix E12 V3.0, and 4.3 mm narrower at its widest point. It is 13 g lighter (with battery).
Dimensions
| Fenix E12 V3.0 Check price ↗ | Olight i3T EOS Check price ↗ | |
| Length | 81.5 mm (3.21 in) | 89 mm (3.50 in)+7.5 mm |
| Head / width | 19.3 mm (0.76 in) | 15 mm (0.59 in)−4.3 mm |
| Body | 17.4 mm (0.69 in) | 15 mm (0.59 in)−2.4 mm |
| Weight | 53.9 g with battery | 41 g with battery−13 g |
| Battery | AA | AAA |
| Max output | 200 lm | 180 lm |
| Throw | 78 m | — |
| Type | EDC | EDC |
| Price | $29.95 at fenixlighting.com, as of Nov 4, 2026 | $17.99 at olight.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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E12 V3.0 vs i3T EOS: how they differ
Size and weight
The Fenix E12 V3.0 is the shorter light: 81.5 mm (3.21 in) against 89 mm (3.50 in), a difference of 7.5 mm (8%). At its widest point the Olight i3T EOS is 4.3 mm slimmer (15 vs 19.3 mm). The Olight i3T EOS is 13 g lighter (41 g vs 53.9 g, with battery).
Brightness and throw
The Fenix E12 V3.0 is rated brighter: 200 lm maximum vs 180 lm for the Olight i3T EOS, 11% more.
Battery
The Fenix E12 V3.0 runs on a removable AA battery; the Olight i3T EOS runs on a removable AAA battery. For scale, a AA cell is about 14.5 × 50.5 mm and a AAA about 10.5 × 44.5 mm (nominal).
Price
When we checked on Nov 4, 2026, the Fenix E12 V3.0 was $29.95 at fenixlighting.com and the Olight i3T EOS $17.99 at olight.com, so the Olight i3T EOS cost $11.96 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Fenix E12 V3.0 if you want a shorter light (7.5 mm shorter) and more output (200 lm vs 180 lm). Choose the Olight i3T EOS if you want a slimmer profile (4.3 mm narrower) and less weight (13 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix E12 V3.0 Check price ↗ Olight i3T EOS
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
E12 V3.0 vs i3T EOS FAQ
Which is smaller, the Fenix E12 V3.0 or the Olight i3T EOS?
The Fenix E12 V3.0 is the shorter light: 81.5 mm (3.21 in) against 89 mm (3.50 in), a difference of 7.5 mm (8%). At its widest point the Olight i3T EOS is 4.3 mm slimmer (15 vs 19.3 mm). The Olight i3T EOS is 13 g lighter (41 g vs 53.9 g, with battery).
Which is brighter, the Fenix E12 V3.0 or the Olight i3T EOS?
The Fenix E12 V3.0 is rated brighter: 200 lm maximum vs 180 lm for the Olight i3T EOS, 11% more.
Which is cheaper, the Fenix E12 V3.0 or the Olight i3T EOS?
When we checked on Nov 4, 2026, the Fenix E12 V3.0 was $29.95 at fenixlighting.com and the Olight i3T EOS $17.99 at olight.com, so the Olight i3T EOS cost $11.96 less. Prices change often, so check the current price before you buy.
Do the Fenix E12 V3.0 and Olight i3T EOS use the same battery?
The Fenix E12 V3.0 runs on a removable AA battery; the Olight i3T EOS runs on a removable AAA battery. For scale, a AA cell is about 14.5 × 50.5 mm and a AAA about 10.5 × 44.5 mm (nominal).
Compare Fenix E12 V3.0 with similar lights
Compare Olight i3T EOS with similar lights
More
Sources
- Fenix E12 V3.0: specs from Fenix product page (manufacturer). Price $29.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Olight i3T EOS: specs from Olight product page (manufacturer); manufacturer published specs as listed by batteryjunction.com. Price $17.99 from olight.com, checked Nov 4, 2026; prices change often.
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