Visual Systems
LT154/155/156 Installation Data
Desktop and Ceiling Mount
Rev. 1.8
Page 1
Contents
Product Description, Lens Specs, Notes and Formulas
Page 1
Projection Distances and Screen Sizes
Ceiling Mount Installation
Page 2
Desktop Setup
Page 3
Cabinet Dimensions
Top,
Front
and
Left
Side
Page 4
Bottom,
Back
and
Right
Side Page 5
Ceiling Mount Dimensions
Top,
Front
and
Left
Side
Page 6
Bottom,
Back
and
Right
Side Page 7
PC Control Codes
Page 8
Product
Description
Type:
LT154: 3 panel, 0.9” p-Si non-MLA LCD projector
Native Resolution:
1024 x 768
LT155:
3
panel,
0.9”
p-Si
w/MLA
LCD
projector Dimensions:
8.2”(W)
x
11.1”(D)
x
2.8”(H)
LT156: 3 panel, 0.9” p-Si w/MLA LCD projector, w/DVI Input
Weight:
4.9 lbs
Brightness: LT154: 900 ANSI Lumens
LT155/156:
1200
ANSI
Lumens
Lens Specifications
Throw
Ratio:
1.9-2.0:1(Wide)
/
2.2-2.3:1(Tele) Focal
Length:
36.5
–
42mm
Offset
Angle:
9.0°
(Wide)
/
7.5°
(Tele)
F/#: 2.0
–
2.3
Screen Sizes:
25” – 300” Diagonal
Focus Adjustment: Manual Focus / Manual Zoom
Notes
For Screen Sizes of 25 to 300 inches not indicated on the projection tables, use the formulas below.
If the figures on the tables do not match the results of formulas, use the figures in the table.
The ceiling must be strong enough to support the LCD projector and the installation must be in accordance with any local
building codes.
•
All calculations are based on 4:3 aspect ratio.
•
Distances are in inches, for millimeters multiply by 25.4.
•
Distances may vary
±
5%.
Formulas
Units: Inches
(for millimeters multiply final number by 25.4)
D
= Screen Diagonal (4:3)
H
= D x 0.8
H
= Screen Width (4:3)
V
= D x 0.6
V
= Screen Height (4:3)
M
1.38889H
M
= Projection magnification
B
= 0.2165M
B
= Vertical distance between lens center and screen center
C
(Wide) = 1.4483M – 2.165
C
= Throw distance
C
(Tele) = C (Wide) x 1.15
D
= 0.0535M
D
= Vertical distance between lens center and top of screen (bottom of screen
for desktop application)
α
αα
α
(wide) = tan
-1
(B/C(wide))
α
αα
α
= Throw angle
α
αα
α
(tele) = tan
-1
(B/C(tele))
