Knoll Light Factory used to have a separately-maintained version (Knoll Light Factory for Photoshop) that has since been discontinued.
If you own Knoll Light Factory and are looking to use it with Photoshop, you can use the installation instructions here to use it with its last compatible versions of Photoshop.
If you do not own Knoll Light Factory, you will need to purchase it to obtain Knoll Light Factory for Photoshop; it is not possible to procure it as a separate plugin.
If you decide to use this discontinued product, be sure to understand that:
- It will no longer be updated to work with later versions of Photoshop
- It will not be updated to work with updated versions of OS X or Windows
- Bugs encountered will not be fixed
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