Convoy M21H vs Olight Seeker 3 size comparison
The Olight Seeker 3 is 2.8 mm (0.11 in) shorter than the Convoy M21H, and 5 mm narrower at its widest point.
The Olight Seeker 3 is 2.8 mm (0.11 in) shorter than the Convoy M21H, and 5 mm narrower at its widest point.
Dimensions
| Convoy M21H Check price ↗ | Olight Seeker 3 Check price ↗ | |
| Length | 130.8 mm (5.15 in) | 128 mm (5.04 in)−2.8 mm |
| Head / width | 40 mm (1.57 in) | 35 mm (1.38 in)−5 mm |
| Body | 27 mm (1.06 in) | 27.5 mm (1.08 in)+0.5 mm |
| Tail | 28.5 mm (1.12 in) | — |
| Weight | — | 184 g with battery |
| Battery | 21700 | 21700 |
| Max output | — | 3,500 lm |
| Throw | — | 220 m |
| Type | EDC | EDC |
| Price | from $44.95 at nealsgadgets.com, as of Nov 4, 2026 | $119.95 at olight.com, as of Nov 4, 2026 |
| Source | nealsgadgets.com sourced | olight.com sourced |
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M21H vs Seeker 3: how they differ
Size and weight
The Olight Seeker 3 is the shorter light: 128 mm (5.04 in) against 130.8 mm (5.15 in), a difference of 2.8 mm (2%). At its widest point the Olight Seeker 3 is 5 mm slimmer (35 vs 40 mm).
Brightness and throw
The Olight Seeker 3 is rated at 3,500 lm; we have no published maximum for the Convoy M21H.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Convoy M21H was from $44.95 at nealsgadgets.com and the Olight Seeker 3 $119.95 at olight.com, so the Convoy M21H cost $75.00 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 Olight Seeker 3 if you want a slimmer profile (5 mm narrower). On the specs we track, the Olight Seeker 3 is ahead or level everywhere; the Convoy M21H makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy M21H Check price ↗ Olight Seeker 3
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M21H vs Seeker 3 FAQ
Which is smaller, the Convoy M21H or the Olight Seeker 3?
The Olight Seeker 3 is the shorter light: 128 mm (5.04 in) against 130.8 mm (5.15 in), a difference of 2.8 mm (2%). At its widest point the Olight Seeker 3 is 5 mm slimmer (35 vs 40 mm).
Which is cheaper, the Convoy M21H or the Olight Seeker 3?
When we checked on Nov 4, 2026, the Convoy M21H was from $44.95 at nealsgadgets.com and the Olight Seeker 3 $119.95 at olight.com, so the Convoy M21H cost $75.00 less. Prices change often, so check the current price before you buy.
Do the Convoy M21H and Olight Seeker 3 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Convoy M21H with similar lights
Compare Olight Seeker 3 with similar lights
More
Sources
- Convoy M21H: specs from manufacturer published specs as listed by nealsgadgets.com. Price from $44.95 from nealsgadgets.com, checked Nov 4, 2026; prices change often.
- Olight Seeker 3: specs from Olight product page (manufacturer). Price $119.95 from olight.com, checked Nov 4, 2026; prices change often.
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