The difference that matters
The BenQ LK830ST is brighter (4,000 lumens against 3,500). The Optoma UHZ35ST costs $300 less at the prices we observed.
Side by side
| Specification | BenQ LK830ST | Optoma UHZ35ST |
|---|---|---|
| Brightness | 4,000 lm | 3,500 lm |
| Resolution | 4K UHD (3840 × 2160) | 4K UHD (3840 × 2160) |
| Native aspect | 16:9 | 16:9 |
| Throw ratio | 0.5:1 | 0.496:1 |
| Distance for a 10.5 × 8 ft 4:3 screen | 7′ | 6′ 11″ |
| Brightness on that screen | 36 fL | 31 fL |
| Light source | Laser | Laser |
| Rated life | 20,000 h | 30,000 h |
| Zoom | Fixed | Fixed |
| Lens shift | — | — |
| Input lag | — | 4.4 ms (1080p 240 Hz); 16 ms (4K 60 Hz) |
| Price seen | $2,499 | $2,199 |
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 LK830ST
Choose the BenQ LK830ST if your room has ambient light or a large screen.
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