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NEC LT154 Installation Instruction

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       Visual Systems 
LT154/155/156 Installation Data 
Desktop and Ceiling Mount
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Rev. 1.8 
                                                                    Page 3 
 
Projection Distance and Screen Size for Desktop 
The following diagram shows the relationship between projector position and the screen. 
Distances are in inches. For millimeters multiply by 25.4. 
 
Desktop Setup 
α
C
B
D
Lens Ctr
Screen Ctr
Throw Distance
Screen Bottom
1.6"
Projector Foot
Distance Chart 
 
Note: 
For screen sizes of 25 to 300 inches not indicated on the projection tables, use the formulas on page 1. 
 
 
B
C
D
α
αα
α
Diagonal
Width
Height
wide - tele
wide - tele
40"
32"
24"
10"
62" - 72"
2"
8.8° - 7.7°
60"
48"
36"
14"
94" - 109"
4"
8.7° - 7.6°
67"
53.6"
40.2"
16"
106" - 122"
4"
8.6° - 7.6°
72"
57.6"
43.2"
17"
114" - 131"
4"
8.6° - 7.5°
84"
67.2"
50.4"
20"
133" - 153"
5"
8.6° - 7.5°
90"
72"
54"
22"
143" - 164"
5"
8.6° - 7.5°
100"
80"
60"
24"
159" - 183"
6"
8.6° - 7.5°
120"
96"
72"
29"
191" - 220"
7"
8.6° - 7.5°
150"
120"
90"
36"
239" - 275"
9"
8.6° - 7.5°
180"
144"
108"
43"
288" - 331"
11"
8.6° - 7.5°
210"
168"
126"
51"
336" - 386"
12"
8.6° - 7.5°
240"
192"
144"
58"
384" - 442"
14"
8.6° - 7.4°
270"
216"
162"
65"
432" -   ----
16"
8.5° -    ---
300"
240"
180"
72"
481" -   ----
18"
8.5° -   ---
Screen Size