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Fluoro tubes used to do that when the starter was about to die (little round thing underneath the tube usually). Could replace for peanuts. Take a pic and someone with more of a clue than me might have a different opinion.
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Probably old Halogen drivers dying due to be connected to low power drawing LEDs. You'll have to pull them out and replace either the driver or ditch the driver and connect to direct fit GU10s.
(had similar dilemma a few weeks ago).
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If you have had a mixture of halogen and led lamps on a dimmed circuit and the halogen lamps start dying you can eventually end up in a position where the dimmer can't produce a low enough voltage for the led lamps alone. In this case you can change the dimmer module.
If you have MR16 lamps with dimmers you should change to GU10 lamps by removing the transformers and wiring GU10 connectors directly + change the dimmer module to an LED compatible one.
You may have a non dimmable LED lamp which can cause the flickering and weird dimming behaviour too.
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Do you have a fancy dimmer switch? If you press on/off too quickly they go into program mode and go dim - bright- dim to show you they are in that mode and then you spend half an hour trying to find the online pdf for the particular model and the on/off dim/bright steps to get out of the mode.
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@dicki
the low voltage ( i think ) lights in my kitchen ceiling are flickering bright one second dim the next sometimes working sometimes not, no real logic to their changes of heart ? what can be causing it ? admittedly a few bulbs are not working would their absence be causing voltage fluctuations ( possible short-circuiting ) ? I honestly don't know what type of bulbs or system they are but with the nights drawing in it's tricky making supper when your in the middle of a dimly lit disco