Emisar D4S vs RovyVon E300S G2 size comparison
The RovyVon E300S G2 is 4 mm (0.16 in) shorter than the Emisar D4S, and 2 mm narrower at its widest point.
The RovyVon E300S G2 is 4 mm (0.16 in) shorter than the Emisar D4S, and 2 mm narrower at its widest point.
Dimensions
| Emisar D4S Check price ↗ | RovyVon E300S G2 Check price ↗ | |
| Length | 105 mm (4.13 in) | 101 mm (3.98 in)−4 mm |
| Head / width | 39 mm (1.54 in) | 37 mm (1.46 in)−2 mm |
| Body | 32 mm (1.26 in) | — |
| Thickness | — | 17 mm (0.67 in) |
| Weight | — | 90 g listed |
| Battery | 26650 | Built-in |
| Max output | 4,300 lm | 2,400 lm |
| Throw | — | 130 m |
| Type | EDC | EDC |
| Price | not verified yet | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | nealsgadgets.com sourced | batteryjunction.com sourced |
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D4S vs E300S G2: how they differ
Size and weight
The RovyVon E300S G2 is the shorter light: 101 mm (3.98 in) against 105 mm (4.13 in), a difference of 4 mm (4%). At its widest point the RovyVon E300S G2 is 2 mm slimmer (37 vs 39 mm).
Brightness and throw
The Emisar D4S is rated brighter: 4,300 lm maximum vs 2,400 lm for the RovyVon E300S G2, 79% more.
Battery
The Emisar D4S runs on a removable 26650 battery; the RovyVon E300S G2 runs on a built-in rechargeable battery. Only the Emisar D4S lets you swap in a charged spare.
Type
Both are EDC lights in our catalog.
Which should you buy?
Choose the Emisar D4S if you want more output (4,300 lm vs 2,400 lm) and a removable cell you can swap. Choose the RovyVon E300S G2 if you want a shorter light (4 mm shorter), a slimmer profile (2 mm narrower) and a built-in battery with no separate cell to buy. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4S Check price ↗ RovyVon E300S G2
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
D4S vs E300S G2 FAQ
Which is smaller, the Emisar D4S or the RovyVon E300S G2?
The RovyVon E300S G2 is the shorter light: 101 mm (3.98 in) against 105 mm (4.13 in), a difference of 4 mm (4%). At its widest point the RovyVon E300S G2 is 2 mm slimmer (37 vs 39 mm).
Which is brighter, the Emisar D4S or the RovyVon E300S G2?
The Emisar D4S is rated brighter: 4,300 lm maximum vs 2,400 lm for the RovyVon E300S G2, 79% more.
Do the Emisar D4S and RovyVon E300S G2 use the same battery?
The Emisar D4S runs on a removable 26650 battery; the RovyVon E300S G2 runs on a built-in rechargeable battery. Only the Emisar D4S lets you swap in a charged spare.
Compare Emisar D4S with similar lights
Compare RovyVon E300S G2 with similar lights
More
Sources
- Emisar D4S: specs from manufacturer published specs as listed by nealsgadgets.com. No verified price yet.
- RovyVon E300S G2: specs from manufacturer published specs as listed by batteryjunction.com. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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