I notice Line Lights differ in the way they look when they are different lengths.
See attached is a render showing 3 line lights. 500mm, 2400mm and 19200mm.
Why is this??
The 2400 is looking the best for what I need but could be better.
Then there seems to be a BUG.
When a Line Light is created vertically it does not show except when it touches or intercepts anoher surface.
It will also show a black line in Renders eventhough it has a color from creation.
What I tried doing is having the same effect as the line light has running horizontally like a edge glow on the vertical corners.
Make the texture 50% transparent with glow selected
I made the lightboxes have a falloff by adding additional spotlights and raising the box about 3mm.
Not very successful, but looks good with the line light I added. When other lights are swithed off you can see the falloff