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PG-M10SU/SE
PG-M10XU/XE
2.Measuring illuminance
Tools required
1. Personal computer (run on Windows 95/98)
2. Projection screen (normally white)
3. Light distribution point display program (Lumens.exe program commonly used for both models UP and U2)
4. Illumination meter
Measuring lumen value
Connect the projector to the PC, and starts lighting.
Start up the light distribution point display program
(Lumens.exe) on the PC. Make the room dark. (A
darkroom is recommended.) Measure the illuminance
at the nine points shown at right. Put the measured
illuminance into the following equation to obtain the
lumen value.
Lumen value (L)
Evenness of illuminance
Put the measured illuminance into the following equation to obtain the evenness of illuminance.
Evenness of illuminance (%) = (The lowest illuminance measured out of 9 points) / (Average illuminance of 9 points)
Peripheral illuminance ratio
Put the measured illuminance into the following equation to obtain the peripheral illuminance ratio.
Peripheral illuminance ratio (%) = (Average illuminance at P1, P3, P7 and P9) / (Illuminance at P5)
The factory settings are as follows.
Model PG-M10X
Lumen value: Min. 500 Lm Evenness of illuminance: Min. 50%
Model PG-M10S
Lumen value: Min. 500 Lm Evenness of illuminance: Min. 50%
= (Average illuminance of 9 points) x (Projected area in m
={(P1+P2+ • • • +P9) / 9} x (A xB)
= [MIN.(P1~P9) / {(P1+P2+ • • • +P9) / 9}] x 100
= {(P1+P3+P7+P9) / 4} / P5] x 100
A
Peripheral illuminance ratio: Min. 80%
Peripheral illuminance ratio: Min. 80%
18
B
2
)
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