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Originally Posted by RAJAH235
Norm, sounds to me like the base assembly, (pins/contacts), are of an inferior quality. The halogen globes run extremely hot & if the hardware ain't up to it.....
The 'black/sooty' appearance means that the globe connections are not tight, eg; loose pins in the ceramic base, which causes a high resistance connection & generates more heat........which in turn will de-temper the metal base pins even more......
Replace the bases & globes, with better quality ones n prob should disappear.
HTH.  L. |
As Rajah says, with any loose connection, especially applications with high current and/or (as in this case) are subject to heat, thermal runout occurs. this is where resistance causes more heat, more heat creates higher resistance, and so on until something burns out.
We have just finished a major reno at our place and have installed around 2 dozen downlights. Originally I wanted the 12V type, but my sparkie talked me out of it,
saying that the 12V transformers have only a short-ish life expectancy. I didn't fancy scrabbling around in my cramped cieling space in a tropical summer to replace them, so we went 240V with great success.
Good luck on the repairs to your system. Hope you get them all working again
Cheers