Tested on multiple Desktop Environments, this is the cool version which works much better than desktop files you’ll find in most tutorials over the web:
[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Light Table
Icon=ltbin.png
Path=/path/to/your/LightTable
Exec=/path/to/your/LightTable/ltbin --no-sandbox --process-per-tab --allow-file-access-from-files --enable-experimental-web-platform-features --enable-css-shaders
StartupNotify=false
StartupWMClass=Ltbin
OnlyShowIn=Unity;
X-UnityGenerated=true
Hope this’ll work for you as well.
Cheers!