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Hello, LED spotlights are all light decay, generally after more than a year of use, the light will be a little darker than before, which is also a normal phenomenon.
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You can rule out problems with lamps, check transformers, or contact problems, most likely of which are transformer problems!
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If according to what you say, it should be that the current is unstable, are you sure that you are changing the whole set of LED lights or only changing the LED lights without changing the transformer??
Probably the reason is that the load is too low. The wire diameter is too thin. The voltage is too low, and the wiring of the terminal post is not strong enough.
This is done with pliers and special tools such as: destructive demolition is useless, thank you.
What is the main function of these spotlights? I think it's generally a series.
Generally speaking, depending on the space, if you feel that the brightness spotlight is too small, the downlight will be more suitable, generally placed in the bathroom or kitchen, as a mirror front lamp or a special area light in the washing area. Melkite ceiling small class
With a lot of warm white! Our company specializes in the production of LED spotlights and strip lights! You can choose.