What is .P3L file?
3D light settings file used by Adobe Photoshop, an image-editing program; stores the color, locations, directionality, and magnitudes lights in a three-dimensional space; can store point, spot, infinite, and image-based lights; used by Photoshop's 3D image-editing component to save and load preset lighting properties and add them to one or more 3D scenes.
Photoshop CS5 includes several lighting preset files which are stored in the /Presets/Lights/ directory. Preinstalled P3L files include:
Recommended Software Programs to open .P3L file