Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | BenQ - W5800 | BenQ - X3100i |
|---|---|---|
| Brightness | 2600 lm | 3300 lm |
| Light source | Laser | LED |
Between the W5800 and X3100i, the W5800 comes out ahead in light source, while the X3100i wins on brightness. Overall, the W5800 scores 71.1 and the X3100i scores 76.6 on our Mars Score.
Which should you buy?
The X3100i edges ahead on the Mars Score (71.1 vs 76.6), but the 5.5-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the W5800 if you care most about light source. The biggest gaps in its favor are light source. The single most decisive one: Light source: Laser (vs LED).
Pick the X3100i if you care most about brightness. Its strongest claims are brightness. The single most decisive one: Brightness — 26.92% more. 3300 lm vs 2600 lm.
Both ship with comparable resolution, short-throw, so those specs do not separate the two — focus on the differences below.
Bottom line: the X3100i is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: BenQ - W5800 or BenQ - X3100i?
BenQ - X3100i leads the current Mars Score by 5.5 points.The more useful decision is the trade-off behind that result: compare brightness, light source against the way you will actually use the product.
Choose BenQ - W5800 if…
BenQ - W5800 has the measurable edge on light source.
Choose BenQ - X3100i if…
BenQ - X3100i 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 BenQ - W5800 wins
- ▲Light source: Laser (vs LED).
Why BenQ - X3100i wins
- ▲Brightness — 26.92% more. 3300 lm vs 2600 lm.
Spec comparison
Image
| Spec | BenQ - W5800 | BenQ - X3100i |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 2600 lm | 3300 lmlead |
| Contrast | 2000000:1 | 600000:1 |
| Light source | Laserlead | LED |
| Short-throw | false | false |
Smart & Connectivity
| Spec | BenQ - W5800 | BenQ - X3100i |
|---|---|---|
| Smart OS | None | Android TV |
| HDMI inputs | 2 | 2 |
| Built-in speakers | false | truelead |