I don't understand how a simple light replacing 6/7 ceiling lights is such a big lag issue especially when on the scourge server there are bases often with 10+ windmills, 3 quarries and 1 pumpjack allowed which are performance issues themselves once you factor all the extra stuff for growing/farming as well.
As far as the simple light being abused, that can be moderated by admins quite easily.
My bases tend to run around 25 ceiling lights which i could run 4 simple lights for, this is a reduction in load, even with the fact the light spreads more with the simple light.
If lag problems are a big thing then there is a lot of things that have to go in the scourge server on that basis, yet, they are ok and still in use.