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An Appoge Big Ben Question from a novice

Okay, I've added the big ben as the master in my clock chain all appears to be good, a/d's are clocking and all sounds fine.
So the question I have is that the blue 'narrow' led flickers periodically and not overly bright when it is stable, is this the default behavior?, I ran the led test and the led appears to be okay, The unit is well ventilated and cool to the touch..