LiteCalc: Documentation

1.0     Introduction and System Requirements
2.0     Copying and Distribution
2.1     Warranty
3.0     Brief Directions for using...
3.1       Straight throw...
3.1.1        BeamDia
3.1.2        Ellip, Fres_bp, Par
3.2       Diagonal throw...
3.2.1        Lc1
3.2.2        Lc2
4.0     Source of Data...
5.0     List of Files...
6.0     Address of author

LiteCalc was written in C on an AT&T, PC6300, with an intel 8086 cpu
running under DOS 3.3. No graphic card is needed. I began this project
in 1993 because my Lighting and StageCraft students wanted
an easier way to determine beam diameter (and intensity) than punching
buttons on a calculator or drafting beam angles on a cross section.

The parts of the LiteCalc package, _ellip_, _fres_bp_, _par_, _lc1_, _lc2_,
and _beamdia_ are copyrighted 1995 by Larry Wild and are being distributed
as "contrib_ware." You are granted a limited license to make a copy for
use on a private, non-commercial basis. If you find LiteCalc suitable
to your needs, I ask that you make a $5.00 contribution to your
local "Food Bank."

Use of this software is entirely at your own risk.

I, Larry Wild, make no warranty of any kind, expressed or implied,
including without limitation, any warranties of merchantability and/or
fitness for a particular purpose.  I, Larry Wild, shall not be liable
for any damages, whether direct, indirect, special or consequential arising
from a failure of these programs to operate in the manner desired by the
user.  I, Larry Wild, shall not be liable for any damage to data or
property which may be caused directly or indirectly by the use of these
programs.

IN NO EVENT WILL LARRY WILD BE LIABLE TO YOU FOR ANY DAMAGES, INCLUDING
ANY LOST PROFITS, LOST SAVINGS, OR OTHER INCIDENTAL OR CONSEQUENTIAL
DAMAGES ARISING OUT OF YOUR USE OR INABILITY TO USE THESE PROGRAMS, OR
FOR ANY CLAIM BY ANY OTHER PARTY.

A straight throw is when beam of light is perpendicular to the plane of
focus. Down light, or front light from a low balcony rail are familiar
examples.

There are four executable files which will provide Field/Beam diameters
for a straight throw. _BEAMDIA_ is the generic program. _ELLIP_ (for nine
series of ellipsoidal reflector spotlights), _FRES_BP_ (for 6" and 8"
Fresnels and 10" Beam Projectors), and _PAR_ (for 150 watt PAR38s, 300
and 500 watt PAR56, and 500 and 1000 watt PAR64s) are the menu
controlled programs.

_ELLIP_ contains data on the Altman 3.5Q, 360Q, Professional 1KL, and
Shakespeare 600 series of instruments; the Century-Strand diecast series of
Lekos (R) from the mid '60s (same as the Century 1400 series);
the ETC Source Four (R) series of ellipsoidals, the 6 and 8" Klieglight (R)
series, the new (1994) Strand series of LekoLights (R); and the
Strand-Century series of the late 70's.

At the prompt, enter the (1) field angle of the instrument, and the (2) throw
distance. The program will calculate the (1) field diameter, and the
(2) multiplication factor, and then ask if you want to repeat, (Y or N).

Example:
   How large a pool of light will I get with a 30 foot throw from a
24ø ellipsoidal?
   Answer: The diameter of the pool of light will be almost 13 feet.

Screen Display of BEAMDIA...
=========================================================================
C:\beamdia
----------------------------------------------------------
                     LiteCalc: BeamDia
                   by Larry Wild, c. 1995

 Calculates FieldDiameter, Approx BeamDiameter, MultFactor
                   for FieldAng and Throw
----------------------------------------------------------

Enter the field angle:> 24
Enter throw distance: > 30

Field diameter:            12.8 feet
Mult factor:               0.43

Repeat? (Y or N):> n
=========================================================================

_ELLIP_ (nine series of ellipsoidal reflector spotlights), _FRES_BP_
(6" and 8" Fresnels and 10" Beam Projectors), and _PAR_ (for 150 watt
PAR38s, 300 and 500 watt PAR56, and 500 and 1000 watt PAR64s) are menu
directed programs.

_ELLIP_ contains data on the Altman 3.5Q, 360Q, Professional 1KL, and
Shakespeare 600 series of instruments; the Century-Strand diecast series of
Lekos (R) from the mid '60s (same as the Century 1400 series); the
ETC Source Four (R) series of ellipsoidals, the 6 and 8" Klieglight (R)
series, the new (1994) Strand series of LekoLights (R); and the
Strand-Century series of the late 70's.

At the prompt, choose (1) an instrument series, and (2) a specific
instrument. Then at the prompt, enter the (3) throw distance. The program
will calculate the (1) field diameter, the (2) beam diameter (if the beam
angle is published), and the (3) intensity. You will then be asked if
you want to [R]epeat, return to the [M]ain menu, or [Q]uit.

Example:
   How large a pool of light will I get with a 30 foot throw from a
30ø (6x12) Strand LekoLite (R)?  What will be the intensity of the light
with a 750 watt, EHF lamp?  How many instruments will I need to provide
a full stage wash across a 40' wide proscenium?
   Answers: The pool of light will be almost 15 feet in diameter, with
an intensity of 138 foot candles. Using Bill Warfel's formula
(Stage_width/Beam_diameter) as published in _The New Handbook of Stage
Lighting Graphics_ (NY: Drama Book Publishers, 1990) I will need five
lamps for a full stage wash.

Screen Display for ELLIP.EXE...
===========================================================================
C:\>ellip
---------------------------------------------------------------
        LiteCalc: Ellipsoidals Reflector Spotlights
                by Larry Wild  c.1995
   Calculates FieldDiameter, BeamDiameter, Intensity
---------------------------------------------------------------

Choose an instrument series...
  1- Altman Ellipsoidals
        3.5Q 360Q, 1KL Series, Shakespeare 600 Series
  2- Century-Strand LekoLites (R)
        LekoLite 2211, 2321, 2331, 2341
  3- Colortran Ellipsoidals
         213 Series, 5/50 Series Ellipsoidals (R)
  4- ETC Source Four (R)
  5- Kliegl Brothers KliegLights (R)
  6- Strand Leko (R)
        Leko 2250, 2240, 2230. 2220, 2215
  7- Strand-Century LekoLite
        LekoLite 2204, 2209, 2212, 2216, 2112, 2113, 2123
Series choice:> 6

Choose an instrument...
  1- 50ø (4.5x6.5)  Strand LekoLite (R)
  2- 40ø (6x9)  Strand LekoLite (R)
  3- 30ø (6x12) Strand LekoLite (R)
  4- 20ø (6x16) Strand LekoLite (R)
  5- 15ø (6x22) Strand LekoLite (R)
Instrument choice:> 3 -30ø (6x12) Strand LekoLite (R)

Enter throw distance (in feet):> 30

For a 30 (6x12) Strand LekoLite (R) with a throw of 30.0 feet...
   Field diameter:  14.4 feet
   Beam diameter:   7.9 feet
   Intensity:       188.9 ft-cndls w/ 1000 watt FEL lamp
   Intensity:       137.9 ft-cndls w/ 750 watt EHF lamp
   Intensity:       88.8 ft-cndls w/ 500 EHB lamp

[R]epeat Strand LekoLite (R) | [M]ain Menu | [Q]uit:>q
===========================================================================

A diagonal throw is where the beam of light is not perpendicular to the
plane of focus. Front light from a "cove" position, or side light from a
"pipe end" position are familiar examples.

There are two programs which will calculate Beam/Field diameters and
intensity for diagonal throws. _LC1_ is the generic program. _LC2_ is
the menu controlled program. _LC2_ contains data on eight series of
ellipsoidal reflector spotlights.

At the prompt, enter the  (1) elevation of the instrument above the
stage floor, (2) the plan distance between the lamp and the focus point,
and (3) the field angle of the instrument. The program will calculate
the (1) throw distance between the lamp and the focus point, the
(2) elevation angle of the light (90ø == "down light"), the (3) size of
the "pool" of light, the (4) distance from focus point to the front edge
of the beam, and the (5) distance between the focus point and the back
edge of the beam.

NOTE: LC1 and LC2 make their size and intensity calculations on a "head
height" of six feet. If you wish to calculate for light focused to a
different plane, the stage floor for example, adjust your input for
 accordingly.
For example:
   If the actual elevation of the instrument above the stage floor is
24 feet, and you wish to calculate for light focused on the stage floor,
then enter 30 (24 + 6) as the "elevation of instrument".

The program will then ask if you want to repeat the calculations, Y or
N.

Example:
   How for up stage will the pool of light from a "Cove" mounted
30ø ellipsoidal reach when focused at the curtain line? What will be the
width of the light pool? The front "Cove" is 24 feet above the level of
the stage floor, and 27 feet from the curtain line.

   Answers: The pool of light will extend a little over 26 feet upstage
and will be almost 17 feet wide.

Screen Display for LC1...
==========================================================================
C:\>lc1
---------------------------------------------------------------
            LiteCalc 1: Diagonal Throw
                by Larry Wild  c.1995
    Calculates ThrowDistance, ElevAngle, FieldDiameter
        Distance in Front and Behind FocusPoint
-----------------------------------------------------------------

Elevation________above stage floor:> 24
Plan distance__lamp to focus point:> 27

Field angle__________of instrument:> 30

Throw__Lamp to focus point:       32.4 feet
Elevation angle:                  33.7ø

Size of "pool":                   17.4 x 37.4 feet
   Distance towards lamp:         11.2 feet
   Distance away from the lamp:   26.2 feet

Repeat ? (Y or N):> n
===========================================================================

_LC2_ is a menu directed program containing data on eight series of
ellipsoidal reflector spotlights.

At the prompt, choose (1) an instrument series, and (2) a specific
instrument. Then enter the (1) elevation of the instrument above the
stage floor, and (2) the plan distance between the lamp and the focus point.
The program will calculate the (1) throw distance between the lamp and
the focus point, the (2) elevation angle of the light (90ø == "down light"),
the  (3) size of the "pool" of light, the (4) distance from focus point
to the front edge of the beam, the (5) distance between the focus point
and the rear edge of the beam, the (6) intensity of the light at the
focus point, and the (7) approximate spacing needed to produce an even wash.
The program will then ask if you want to epeat, return to the ain
menu, or uit.

"Pool" size is determined by the instrument's field angle. The approximate
wash spacing is based on a 50% over lap of the light pools.

Example:
   How for up stage will the pool of light from a "cove" mounted Altman 360Q,
6x12, reach when focused at the curtain line? What will be the intensity
with a 750 watt EHF lamp?  How many units will I need to  wash a 40 foot wide
stage?  The front "Cove" is 24 feet above the level of the stage floor,
and 27 feet from the curtain line.

   Answers: The pool of light will extend nearly 21 feet upstage, with
an intensity of 144 fc (with a 750 watt EHF lamp). I will need six
instruments to provide a 40 foot wide full stage wash.

Screen Display for LC2.EXE...
===========================================================================
C:\>lc2
---------------------------------------------------------------
            LiteCalc 2: Diagonal Throw
                by Larry Wild  c.1995
 Calculates ThrowDistance, ElevAngle, FieldDiameter, Intensity
        Distance in Front and Behind FocusPoint
---------------------------------------------------------------

Choose an instrument series...
  1- Altman 360Q (R) Series
  2- Altman 1KL (R) Series
  3- Altman Shakespeare 600 (R) Series
  4- Century Strand LekoLites (R)
         LekoLite 2211, 2321, 2331, 2341
  5- Colortran Ellipsoid (R)
  6- ETC Source Four (R)
  7- Kliegl Bros. KliegLight (R)
  8- Strand LekoLite (R)
        Leko 2250, 2240, 2230. 2220, 2215
  9- Strand Century 2200 Series LekoLite (R)
        LekoLite 2204, 2209, 2212, 2216, 2112, 2113, 2123
Series choice:> 1

Choose an instrument...
  1- 6x4.5 Altman 360Q
  2- 6x9   Altman 360Q
  3- 6x12  Altman 360Q
  4- 6x16  Altman 360Q
  5- 6x22  Altman 360Q
Instrument choice:> 3 -6x12 Altman 360Q

Elevation________Above stage floor:> 24
Plan distance__Lamp to focus point:> 27

Throw__Lamp to focus point:       32.4 feet
Elevation angle:                  33.7ø

With a 6x12 Altman 360Q...
  Size of "pool":                   15.0 x 30.7 feet

  Distance towards lamp:            10.0 feet
  Distance away from the lamp:      20.7 feet

  Intensity @ focus point:          144 ft-cndls w/ 750 watt EHF
                                    91 ft-cndls w/ 500 watt EHB lamp

  Approximate spacing for wash:     7 feet

[R]epeat Altman 360Q | [M]ain menu | [Q]uit:> q
============================================================================

Altman 3.5Q Quartz Ellipsoidals
   Altman spec sheets, 1990
Altman 360Q Quartz Ellipsoidals
   Field angle and beam candle power from Altman spec sheets, 1990
   Beam angle from Lehigh spec sheets, 1976
Altman Professional Series 1K Ellipsoidals
   Data for "Peak distribution"
   Field angle and beam candle power from Altman spec sheets, 1990
   Beam angle from Lehigh spec sheets, 1990
Altman Shakespeare 600 Series Ellipsoidals
   Data for "Peak distribution"
   Altman spec sheets, February 95
Century-Strand (die cast) LekoLites (No. 2211, 2321, 2331, 2341)
   Century-Strand spec sheets, 1970
Colortran 213 Series Ellipsoidals
   Berkey-Colortran spec sheets, 1979
Colortran 5/50 Series Ellipsoidals
   Data for "Peak distribution"
   Colortran spec sheets, November 1992
ETC Source Four Ellipsoidals
   Data for "Cosine distribution"
   ETC spec sheet, 1992; 5ø and 10ø specs sheets, 1993
Klieglites
   Kliegl spec sheets, 1976
Strand LekoLites (No. 2250, 2240, 2230, 2220, 2215)
   Data for "Peak distribution"
   Strand spec sheets, Nov 92
Strand-Century LekoLites (No. 2204, 2209, 2212, 2216, 2112, 2113, 2123)
   Data for "Peak distribution"
   Developed from 1983 Strand-Century Theatrical Lighting Product Schedule
Strand FresneLites (3380, 3480)
   Strand spec sheets, 1991
Strand-Century BeamProjector (4122)
   Developed from 1983 Strand-Century Theatrical Lighting Product Schedule
PAR38, PAR56, PAR56Q, PAR64, PAR64Q
   Field angle and beam candle power from Sylvania Lighting Handbook, 7th
   edition, 1984

   LC1      EXE  -Diagonal throw w/out menu
   LC2      EXE  -Diagonal throw w/ menu, Ellipsoidals
   BEAMDIA  EXE  -Straight throw w/out menu
   ELLIP    EXE  -Straight throw w/ menu, Ellipsoidals
   FRES_BP  EXE  -Straight throw w/ menu, Fresnels and BeamProjector
   PAR      EXE  -Straight throw w/ menu, PAR lamps
   LITECALC TXT  -This file

Larry Wild, Designer/Tech Director
Assistant Professor of Theatre

Northern State University
1200 S. Jay Street
Aberdeen, SD  57401

email: wildl@wolf.northern.edu