Hello, I have had a number of quartz halogen tubes failing after a period of service of only very occasional use. The type is the standard 240V, 400W, 117mm linear with R7 end contacts used in standard fittings with a glass front and situated outdoors. There is no question of contamination by finger grease. The consistent thing is that the filament always looks intact and in excellent condition and yet the tubes are open-circuit. I suspect that the failures may be due to corrosion inside the R7 ceramic end fittings. There may also be an internal fuse of some kind?
Can anyone suggest what the failure mechanism might be and how to avoid it? Although the tubes are cheap enough to buy they are in very awkward places to reach. Thanks for any experience or knowledge of this issue.
Can anyone suggest what the failure mechanism might be and how to avoid it? Although the tubes are cheap enough to buy they are in very awkward places to reach. Thanks for any experience or knowledge of this issue.