Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Anker - Nebula Cosmos Laser 4K | BenQ - W5800 |
|---|---|---|
| Brightness | 2400 lm | 2600 lm |
Between the Nebula Cosmos Laser 4K and W5800, the Nebula Cosmos Laser 4K comes out ahead in several specs, while the W5800 wins on brightness. Overall, the Nebula Cosmos Laser 4K scores 69.5 and the W5800 scores 71.1 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.5 vs 71.1). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
The Nebula Cosmos Laser 4K does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the W5800 if you care most about brightness. Its strongest claims are brightness. The single most decisive one: Brightness — 8.33% more. 2600 lm vs 2400 lm.
Both ship with comparable resolution, light source, short-throw, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Anker - Nebula Cosmos Laser 4K or BenQ - W5800?
BenQ - W5800 leads the current Mars Score by 1.6 points.The more useful decision is the trade-off behind that result: compare brightness against the way you will actually use the product.
Choose Anker - Nebula Cosmos Laser 4K if…
Anker - Nebula Cosmos Laser 4K does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose BenQ - W5800 if…
BenQ - W5800 has the measurable edge on brightness lumens.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Anker - Nebula Cosmos Laser 4K wins
- No decisive advantages.
Why BenQ - W5800 wins
- ▲Brightness — 8.33% more. 2600 lm vs 2400 lm.
Spec comparison
Image
| Spec | Anker - Nebula Cosmos Laser 4K | BenQ - W5800 |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 2400 lm | 2600 lmlead |
| Contrast | 2200:1 | 2000000:1 |
| Light source | Laser | Laser |
| Short-throw | false | false |
Smart & Connectivity
| Spec | Anker - Nebula Cosmos Laser 4K | BenQ - W5800 |
|---|---|---|
| Smart OS | Android TV | None |
| HDMI inputs | 1 | 2lead |
| Built-in speakers | truelead | false |