John McKernon Software

Version 5.0.48, Released November 14, 2015



Yes, Lightwright 5 is compatible with Windows 7 and Mac OSX Snow Leopard

Having trouble figuring out Lightwright?  Would you like to watch John teach you how to use Lightwright 5? Lightwright videos are in production and will begin to be available in the first quarter of 2010.

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Did you move?  Did you make a mistake when registering Lightwright? Then click this link to edit your contact information.

Yes, Lightwright 5 can save LW5 show files in LW4 format, but the LW4 show file will not contain any data related to new LW5 features. Use File/Save As... and choose Lightwright 4 as the file format from the Format popup menu at the bottom of the file dialog window.

If Lightwright 5 for Windows “encounters a problem and has to close” or crashes as soon as it’s launched, launch LW5 again while holding down  the Shift key until the first worksheet window appears. You should only have to do this once, it clears corrupted preferences.

Did Lightwright behave badly?



  1. *Windows XP - Service Pack 3 or Windows Vista or newer
    (that includes Windows 7 and Windows 8)

  2. *A color monitor with at least 1024x768 resolution, 256 colors or better

  3. *Memory: 1 GB, 2GB or more recommended

  4. *Apple QuickTime

  5. *120 MB Free Hard Drive Space

  6. *An internet connection for installation and some features


  1. *OS X 10.4.11 (Tiger) or newer
    (that includes Leopard, Snow Leopard, Mavericks, & Yosemite)

  2. *A color monitor with at least 1024x768 resolution, either  thousands or millions of colors

  3. *Memory: 1 GB, 2GB or more recommended

  4. *120 MB Free Hard Drive Space

  5. *An internet connection for installation and some features

To use Vectorworks/Lightwright Data Exchange on either platform, you must have Vectorworks Spotlight 2009 Service Pack 1 or newer and meet at least the minimum system requirements for Vectorworks. Additional RAM will be needed to support both Lightwright and Vectorworks running simultaneously.

If you’re using a Mac and parts of your paperwork doesn’t show up on the printer, check to see if you have duplicate fonts. Open FontBook and look for little yellow triangular icons that warn you of duplicates. Resolve the duplicates, and everything should print normally.

If you’re using Quicken for Mac and Quicken Scheduler, you will probably find that your arrow keys don’t work properly in Lightwright (and other programs). The only solution is to not use Quicken Scheduler.

If you are using Microsoft Windows and your printer won’t work with Lightwright 5, here’s how to get it working:

1) Go to Start>Control Panel>Printers and Faxes

2) Right-click on printer in question, then go to "Properties"

3) Go to "Advanced" Tab

4) Click the radio button which states "Print Directly to the Printer" and then "Apply"

If Data Exchange is misbehaving, click here to see some solutions to common problems.

If you are having trouble networking computers, click here to see some detailed configuration information.

Click here to file a bug report or post a question
You must be using a modern web browser
(Safari, Chrome, Firefox 3.6.13 or later, Internet Explorer 7 or later)
JavaScript must be enabled, and any Java Debugger you have running must be OFF
If you get an error message, use your web browser’s Reload command

If you think counting is wrong because there are more lights on the worksheet than Lightwright says there are when it counts, then here’s the answer:

Lightwright considers all worksheet rows with the same position name and unit# to be a single light. This is what lets you have more than one worksheet row for a light (for things like additional channels and dimmers for moving lights, smoke machines, etc.). The only exception to this rule is that Lightwright will always consider worksheet rows with unit# zero to be individual lights.