A simple plug and diffuser for @BergiX's demon core lamp  

I printed the dome in vase mode .4 wall 

and the plug as a 2 wall .4  normal print

I used 2 green leds and 1 blue to get an eerie radioactive that mimics Cherenkov radiation 

you can also use a 25mm disk of white paper or some frosted plastic sheet as a diffuser