Lamp, just saying.......
Pretty standard CFL circuit, did not do the normal thing that they do and catch fire, but blew it's internal fuse when the lamp went EOL.
Very stupid to put the complex, high precision and high technology electronics right next to the hottest part of the lamp, but that is CFL tech for you. Years ago you got a CFL lamp where you just could replace the lamp only when it died, and those are still going strong by me, on 24/7 for nearly two decades now, and have only needed lamp changes every 2-3 years in that time. Only problem with them was the cost ( initial cost was high) and that they are somewhat larger than a regular incandescent lamp, so would not fit all fixtures.