Here is a series of short Lightwave 3D tutorial that will help with various problems.

Hope they help:

Lightwave 3D 2020 - adding a HDRI

https://youtu.be/pvpGyQal6QQ

Lightwave 3D 2020 Lighting with a Polygon tutorial

https://youtu.be/qlR6nTbmnSE

Lightwave 3D 2020 Colour space settings tutorial

https://youtu.be/NZzWWsOAK2k