Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Epson - EpiqVision Ultra LS650 | Optoma - UHD35STx |
|---|---|---|
| Light source | Laser | Lamp |
Between the EpiqVision Ultra LS650 and UHD35STx, the EpiqVision Ultra LS650 comes out ahead in light source, while the UHD35STx wins on several specs. Overall, the EpiqVision Ultra LS650 scores 78.9 and the UHD35STx scores 78.9 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes; the decision sits on which individual spec advantages weigh more for your use.
Pick the EpiqVision Ultra LS650 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 Lamp).
The UHD35STx similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable brightness, resolution, 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: Epson - EpiqVision Ultra LS650 or Optoma - UHD35STx?
The two products are effectively tied on the current Mars Score.The more useful decision is the trade-off behind that result: compare light source against the way you will actually use the product.
Choose Epson - EpiqVision Ultra LS650 if…
Epson - EpiqVision Ultra LS650 has the measurable edge on light source.
Choose Optoma - UHD35STx if…
Optoma - UHD35STx does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
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 Epson - EpiqVision Ultra LS650 wins
- ▲Light source: Laser (vs Lamp).
Why Optoma - UHD35STx wins
- No decisive advantages.
Spec comparison
Image
| Spec | Epson - EpiqVision Ultra LS650 | Optoma - UHD35STx |
|---|---|---|
| Resolutionⓘ | 4K | 4K |
| Brightnessⓘ | 3600 lm | 3600 lm |
| Contrast | 2500000:1 | 1000000:1 |
| Light source | Laserlead | Lamp |
| Short-throw | true | true |
Smart & Connectivity
| Spec | Epson - EpiqVision Ultra LS650 | Optoma - UHD35STx |
|---|---|---|
| Smart OS | Android TV | None |
| HDMI inputs | 3lead | 2 |
| Built-in speakers | true | true |