— Projector Throw · Installation / large room
BenQ LK936ST — throw distance & placement, 150-inch
Problem. An installation or large-room brief needs a laser projector that can sit close to the screen without giving up a 150-inch image, and the placement window has to survive a room where the exact mount position is rarely known until site survey.
Answer. At a 150-inch 16:9 screen (3.32 m wide), the BenQ LK936ST throws from roughly 2.69 m to 2.95 m off the screen plane. That 0.26 m of movement is the zoom lens doing its job — it gives the installer a real placement window instead of one fixed distance.
02 / In depth
How this preset reads — the engineering view.
The LK936ST carries a zoom lens with a 0.81-0.89:1 throw ratio, which is a short-throw specification with enough range to matter on site. At a 150-inch 16:9 screen (3.32 m wide) that ratio resolves to a throw distance of 2.69-2.95 m — not a single number but a window. That 1.1x zoom range is what lets an installer land the projector at whatever distance the ceiling grid, joist run or rear-shelf actually allows, then trim focus and image size optically rather than by moving the projector.
5100 lumens is a mid-installation output figure: enough to hold contrast against typical ambient room light in a lobby, boardroom or teaching space, but not intended to fight direct daylight on a large screen. Native 3840x2160 resolution means the panel itself carries UHD detail — worthwhile at 150 inches, where a lower native resolution would show pixel structure at normal seating distance. The laser-phosphor light source is the other half of the brief: it removes lamp-swap intervals from the maintenance conversation and reaches full brightness faster than a lamp engine, both of which matter in spaces where the projector runs long daily hours.
To use the calculator from here, drag the screen size slider away from 150 inches and watch the throw distance move with it — larger screens push the whole 2.69-2.95 m window outward, smaller screens pull it in, while the ratio (and therefore the zoom range) stays fixed. The two numbers either end of the window are the placement latitude the lens itself gives you at this screen size — treat them as the near and far mounting limits, not as a single target distance.
The calculator does not decide screen gain (a matte white and a high-gain ALR surface change how the 5100 lumens actually look), ambient-light rejection (a coated screen vs a plain wall behaves differently under the same room lighting), physical mount hardware, or audio. It also assumes the zoom range quoted for this specific lens; installation-class bodies with interchangeable lenses vary by which lens is actually fitted, so always confirm the lens on the unit in hand before finalising a mount position.
What this preset deliberately does not solve
- The 2.69-2.95 m window is throw distance only — it does not account for screen gain or ambient-light rejection at the viewing position.
- Lens-shift range (if fitted) is not modelled here; it changes vertical/horizontal placement tolerance independently of throw distance.
- Confirm the exact lens variant on the unit before finalising a mount position — quoted throw ratios apply to this lens configuration.
How this preset differs from its siblings
Most installation / large-room projectors in this category are either fixed-lens short-throw units with a single throw distance, or long-throw zoom models meant for ceiling mounts well back from the screen. The LK936ST sits in between: a genuine short-throw zoom (0.81-0.89:1) that still gives an installer a real placement window, which is unusual for the short-throw class. That combination — short throw plus zoom latitude plus native 4K plus laser-phosphor — is specific enough that a generic large-venue or boardroom preset would understate the placement flexibility this model actually offers.
03 / Hydrated calculator
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Lens
Standard Lens
Throw Ratio: 0.81 – 0.89 : 1
Units
Throw Distance
Image Size
Zoom Range
Wide angle to telephoto
Throw distance now 2.82 m
Estimated Image Brightness
262 nits
Comfortable for brighter rooms or smaller screens.
Vertical Shift
±60%
Max 1.12 m from centre
Horizontal Shift
±0%
Max 0 cm from centre
Viewing Distance
6.20 m
THX 5.11 m
Pixel Density
128 PPD
29 PPI on screen
This combination looks workable for first-pass planning. Final placement still depends on the room and screen.
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