LUX/CALC

Chaos AV

1 Projector & lens

Manufacturer

Model

Lens

Light output

Lens transmission

2 Screen & throw

Calculation mode

Total image width

Aspect ratio

Total image height

Throw distance

Distance is measured perpendicular from lens to surface.

3 Stacking & blending

Stack per position

Stack loss

Columns

Rows

Overlap

Stacking adds light. Blending adds size, not brightness – the soft edge dims both projectors in the overlap. Overlap is a share of one projector image (typ. 10–25 %).

4 Geometry & warping

Vertical tilt

+ = tilted up

Horizontal pan

+ = turned right

Lens shift V

% of image height

Lens shift H

% of image width

Additional warping loss

Unused pixels from mapping/curvature: flat 0–5 %, cylinder 10–20 %, dome/facade 20–40 %.

5 Surface & ambient

Projection surface

Gain

Half-gain

Viewer

Half-gain 0° = diffuse (Lambertian). Viewer = angle off the surface normal.

Ambient light

On surface

Best measured with a lux meter at the surface, projectors off.

6 Operating factors

Light source condition

new 100 %, rental fleet often 80–90 %

Tele-end zoom loss

from lens datasheet; scales with zoom position

Picture mode

Power mode

Air / haze in the beam

Rough estimate – haze attenuates light over the throw distance.

Result

Throw ratio vs. lens range

–

7 Front view

Brighter bands = soft-edge zones. Dashed orange: raster of projector 1 before keystone / format correction.

8 Light budget

9 Lens check

10 Requirement

11 Comparison variants added with “+ Add to comparison”

12 All models at this scene

E [lx] = Φ_eff [lm] × pixel share ÷ area of one projector image [m²] · L [cd/m²] = E × gain(θ) ÷ π · contrast = (E + E_amb) ÷ E_amb

Why distance alone does not change lux. In “Fixed image size” mode the lens zooms to keep the image the same size, so the same light lands on the same area – only haze, zoom losses and the lens range change with distance. Switch to “Fixed lens zoom” to see how moving the projector grows the image and lowers the lux (inverse-square law).

Data confidence. Verified light output and lens table taken from the manufacturer's (or ProjectorCentral's) page for this exact model. Family lens table taken from a sibling model of the same series – check the manufacturer's lens calculator before booking. Legacy discontinued but common in rental fleets. Light output is ISO 21118 where published, otherwise ANSI. Picture-mode, eco and haze factors are typical values, not device measurements.

Sources. Panasonic lens docs · Barco · Christie · ProjectorCentral · Epson, Sony and Sharp/NEC spec sheets (as of 09/2026).

LUX/CALC

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