The difference that matters
The BenQ LH860ST throws a given image from closer (ratio 0.5 against 0.79). The Optoma ZK521ST-B lists higher resolution (4K UHD). The BenQ LH860ST costs $300 less at the prices we observed.
Side by side
| Specification | BenQ LH860ST | Optoma ZK521ST-B |
|---|---|---|
| Brightness | 5,000 lm | 5,000 lm |
| Resolution | Full HD 1080p (1920 × 1080) | 4K UHD (3840 × 2160) |
| Native aspect | 16:9 | 16:9 |
| Throw ratio | 0.5:1 | 0.79:1 |
| Distance for a 10.5 × 8 ft 4:3 screen | 7′ | 11′ 1″ |
| Brightness on that screen | 45 fL | 45 fL |
| Light source | Laser | Laser |
| Rated life | 20,000 h | 30,000 h |
| Zoom | Fixed | Fixed |
| Lens shift | — | Vertical 104–125% |
| Input lag | — | 16.7 ms (4K 60 Hz); 8.6 ms (1080p 120 Hz) |
| Price seen | $2,399 | $2,699 |
Highlighted rows differ. Figures come from each product's sources; room depth, distances and brightness are FOREference calculations using the same method for both.
Which should you choose?
BenQ LH860ST
Choose the BenQ LH860ST if you need to mount it close to the screen or price leads the decision.
Before you buy either
- Check the room: room size calculator and ceiling height calculator.
- Confirm what each seller includes — accessories, software trials and bundles change often.
- Read the limitations on each full reference page.
FOREference compares published specifications; we have not tested these products side by side. How we work · Disclosure