Windlight issues

If your grid is set up properly, externally, you should be able to use fully featured region and parcel environment settings.

Firestorm allows for a complete environment editor. Older viewers, such as singularity, cannot use all the environment settings available to newer viewers and may appear ‘corrupt’ (oversaturated, excessively bright)

To make Region Windlight/Environment settings compatible with oldschool viewers just use a script that only modifies parameters available to those viewers.
https://www.outworldz.com/cgi/freescripts.plx?ID=1122

You can just keep hitting ‘random’ on that script til it spits out a setting you like for your local environment settings.

The moment you change/modify those settings in firestorm you run the risk of making the environment extremely distorted for older viewers.

This will limit your functionality a little but it will also make it compatible with all viewers.