Theatre Design & Technology - Winter 1991 - 60

the photometric data for the instruments
you try out in your calculations. If your
spreadsheet has macro capabilities, you
can automate much of this process.
First, create a file called "menu" and
design a menu that states:
Calculate a beam section using:
a. Height and Base
b. Elevation Angle and Base
c. Height and Elevation Angle
d. Exit the program
Then assign macros to the A, B, C,
and X keys that will load the
corresponding template.
Create a small spreadsheet file for
each of the luminaires in your inventory.
In the cells corresponding to the "Input
Field Angle" and "Input Peak Candela"
(cells B5 and B6), enter the field angle
and peak candela for that instrument.
Then create a macro that will
COMBINE the values in the instrument
file into the same cells in the beam
section template. Voila! Instant
photometric data. Also, list your
instruments in a part of the spreadsheet
you can jump to for reference (most
spreadsheets have a "Go To: " command):

a. 6x9
b.6x12
c. 6" Fresnel (Flood)
d. 6" Fresnel (Spot)
Then assign the macros for COMBINING the photometric data to the
letter preceding the instrument. ALTA
would input a 6x9 into the beam section
calculator. In this way you can make
"what if?" calculations with ease by
changing instruments, height, base and
elevation angle at a press of a key.
Additional macros for printing the
calculated data and returning to the
main menu make the package completelyautomated.
STANDALONE
Admittedly, to computerize the calculations in this way requires the
spreadsheet package itself. This can cost
as much as customized software when
dealing with a spreadsheet like Lotus or
Symphony. Shareware programs like PC
Calc are much cheaper and have many
ofthe capabilities of the big packages. A
"stand alone" program would be the
ideal, however.
I recently took the "code" from the

spreadsheet model of the calculator and
translated it into the C programming
language. The result is a stand alone
version of the beam section calculator.
This will run by itself without the help
of a spreadsheet program. This version
finally fulfilled my goal of beam sections
fast and cheap. I use the program continuously, only returning to the drafting
method when confronted with ceilings,
chandeliers, stairs, windows and the like.
There are presently two versions of
the program: LITE 1.0 and LITE 1.5.
The first version is the bare-bones
calculator. The second version adds a
menu interface, error checking, online
documentation and photometric
datafiles viewable from within the
application. I have uploaded LITE 1.0 to
the CallBoard where you may download
it directly to your computer. LITE 1.0 is
offered as shareware and is only
compatible with MS-DOS equipment.
This method of calculation provides
the lighting designer with valuable
information that is fast, accurate and
affordable.

IE

Douglas J. Rathbun is the Coordinator of
the Technical Theatre Department of
Mount Royal College in Calgary, AB.

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yet????!

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Table of Contents for the Digital Edition of Theatre Design & Technology - Winter 1991

Contents
Theatre Design & Technology - Winter 1991 - 1
Theatre Design & Technology - Winter 1991 - 2
Theatre Design & Technology - Winter 1991 - 3
Theatre Design & Technology - Winter 1991 - Contents
Theatre Design & Technology - Winter 1991 - 5
Theatre Design & Technology - Winter 1991 - 6
Theatre Design & Technology - Winter 1991 - 7
Theatre Design & Technology - Winter 1991 - 8
Theatre Design & Technology - Winter 1991 - 9
Theatre Design & Technology - Winter 1991 - 10
Theatre Design & Technology - Winter 1991 - 11
Theatre Design & Technology - Winter 1991 - 12
Theatre Design & Technology - Winter 1991 - 13
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