— Projector Throw · Ultra-short-throw laser TV
LG HU915QE - throw distance & placement (100-inch)
Problem. A living room wants a 100-inch image without a ceiling mount or a bulky console, and needs to know exactly how close the LG HU915QE can sit to the wall before committing to furniture and cabinetry.
Answer. At a 0.19:1 throw ratio, the LG HU915QE needs only about 0.42 m from lens to a 100-inch 16:9 screen, so the unit sits on a low console just centimetres from the wall rather than at the back of the room. The planner shows this placement before any furniture or wall-prep decision is made.
02 / In depth
How this preset reads — the engineering view.
The LG HU915QE is an ultra-short-throw (UST) laser TV, so the placement question is inverted compared with a normal projector: instead of finding enough room length, the task is confirming the unit sits close and square to the wall. At the preset's 100-inch 16:9 screen (2.21 m wide), the 0.19:1 throw ratio puts the lens about 0.42 m from the wall - typically a low media console rather than a rear-of-room mount.
At 3700 lumens with a tri-laser RGB light source, this unit is built for rooms with some ambient light rather than a fully blacked-out theatre, and it drives a native 3840x2160 panel so a 100-inch image holds detail on data and film content alike. It genuinely suits a living room or den where the projector must double as the everyday screen, not a dedicated cinema that stays dark all day.
From this preset, drag the screen-size input larger or smaller to watch the throw distance move in step with the fixed 0.19:1 ratio - useful for checking how much console-to-wall clearance a bigger or smaller image demands. Because the cabinet sits this close to the wall, confirm the console depth and cable routing early, and pair the unit with an ambient-light-rejecting (ALR) screen if the room isn't dimmable, since UST optics are especially sensitive to washout from overhead and side light.
The calculator does not decide screen gain, the ambient-light-rejection level of the screen material, mounting or console hardware, the exact lens on any interchangeable-lens body, or the audio setup around the display - those remain separate decisions for the room design.
What this preset deliberately does not solve
- UST placement tolerance is physical: the console position and wall flatness matter as much as the throw-ratio number.
- 3700 lumens is a data-sheet figure; perceived brightness depends heavily on ambient light and the screen's gain and ALR properties.
- This preset assumes the fixed lens on this model - it does not model interchangeable-lens throw variability.
How this preset differs from its siblings
Other ultra-short-throw laser TV projectors on this calculator sit at longer throw ratios and lower lumen outputs, so their consoles need more wall clearance for the same screen size. The LG HU915QE's 0.19:1 ratio is among the shortest in this class, meaning it needs noticeably less lens-to-wall distance than typical UST models - a real difference when a room has a shallow alcove or a console that can't move away from the wall. This page exists so a reader can size that specific clearance for this specific model rather than a generic UST assumption.
03 / Hydrated calculator
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Presets are a typology starting point. The brief wizard captures the room geometry, programme and constraints we need to translate this configuration into a real design.