10 Best reputed electrical technician - Service Technician Blog Pages - They were equipped with 2 each 18”, 15W tubes and electronic ballasts. On disassembly for conversion to LED operation it was discovered the ballasts have discolored due to high heat (see closest end of ballast in Picture 2). In our new 5th Wheel RV, we received some ceiling mounted 12VDC florescent fixtures. Electric service forum pages and blogs on wall socket diagnosis, circuit breaker troubleshooting, faulty wiring inspection. The overheating was certainly not due to ambient temperatures which have been in the low 70s or cooler. Their performance has been dismal with operation limited to, initially 30-45 minutes before shutting down due to overheating of the ballast. The “on” time got progressively shorter over the next few weeks. The fixtures are a “Low Voltage RV Luminaire” from “Direct Sourcing Alliance” identified as “Type RVL 18RNB-W”, “2 x 15W”, “Input Rating: 12V DC, 30W” ..More