Sofirn SC18 vs Streamlight ProTac 1L-1AA size comparison

SC18 vs ProTac 1L-1AA: how they differ

Size and weight

The Sofirn SC18 is the shorter light: 101.5 mm (4.00 in) against 108 mm (4.25 in), a difference of 6.5 mm (6%). At its widest point the Streamlight ProTac 1L-1AA is 0.7 mm slimmer (24 vs 24.7 mm). Weights are published on different bases (Sofirn SC18: 55 g without battery; Streamlight ProTac 1L-1AA: 71 g listed), so they are not directly comparable.

Brightness and throw

The Streamlight ProTac 1L-1AA is rated at 350 lm; we have no published maximum for the Sofirn SC18.

Battery

The Sofirn SC18 runs on a removable 18650 battery; the Streamlight ProTac 1L-1AA runs on removable CR123A / AA batteries. For scale, a 18650 cell is about 18 × 65 mm and a CR123A about 17 × 34.5 mm (nominal).

Price

When we checked on Nov 4, 2026, the Sofirn SC18 was from $19.99 at flashlightgo.com and the Streamlight ProTac 1L-1AA $56.45 at batteryjunction.com, so the Sofirn SC18 cost $36.46 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 Sofirn SC18 if you want a shorter light (6.5 mm shorter). On the specs we track, the Sofirn SC18 is ahead or level everywhere; the Streamlight ProTac 1L-1AA 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 ↗ Sofirn SC18 Check price ↗ Streamlight ProTac 1L-1AA

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