Requires you to have a disco ball from the Voice Props DLC. It is extremely efficient on a range of up to 10 foundations from the disco ball location. Triangle space can be filled with up to 6 balls, square space with up to 12 balls. Crafting cost is 50 frags per 1 pc. Power consumption 1rW per 1 pc. Significant fps dropdown was observed starting from 70 balls and on.
In other words, this is cheap, efficient, extremely annoying, you can deploy it during any stage of your build and close in honeycombs and it will work with just one large battery. I have not tried cicuit-looping* it to further optimize power consumption but I suspect it could work and may even become a bigger performance killer.
*By this I mean electricity loop that flickers at a fast pace, switching on-off states and benefiting you with overall reduced power consumption