Fourty is a hell of a lot and it would be a good idea to (a) get the circuit checked and (b) make sure there are never too many on all at once.
As the trip is associated with light bulbs blowing I'd guess it's the 'flash on blow' that's causing a transient overlaod and tripping the CB. We've had that issue in every house I've lived in since the demise of fuse wire!!
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