If you open an existing HDR Light Studio project and your preset lights are red, there's a few reasons for why this happens. This video explains the reasons and demonstrates how to fix this issue.
HDR Light Studio is a lighting plugin and is available for Cinema 4D, 3ds Max, Blender, Maya, MODO, Houdini, VRED, Octane Standalone, Rhino, SOLIDWORKS Visualize, Maxwell Studio, LightWave 3D, & DLETAGEN.
Try HDR Light Studio here: https://www.lightmap.co.uk/try/
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