A breaker is a mechanical device and certainly would wear some with manual on and off usage, but it should be minimal and should not cause a problem unless it were defective. There are many commercial applications where the breaker is used for daily on/off use for lighting and other functions. The breaker can fail by having a mechanical part malfunction or perhaps arcing between contacts that would corrode or fuse mechanical contacts.
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A circuit breaker can go bad from being tripped too many times. Many people don't understand that the tripping of a circuit breaker indicates a problem that needs to be corrected. They usually just reset the circuit breaker, leading to a very common second (or third, or fourth) trip. Circuit breakers tripping are for the prevention of fire due to excessive heat in the circuit. They're not supposed to be tripped repeatedly. This can wear the breaker out. Believe it or not, I've also seen circuit breakers fail to re-energize after being turned off. I speculate this was actually caused by the breaker never having been cycled (it was a main breaker), and the time elapsed since it was installed. Electrical equipment doesn't last forever. It's the same as anything else.
I can think of 3 possible problems. 1. The most likely problem is you have a bad light. Try replacing it with another light, even one that is not a grow light, to see if the breaker still trips. My guess is it won't which means you need a new grow light. 2. If the circuit still trips, you likely have a problem with the circuit wiring itself. You may need to hire a competent electrician to fix this problem by rewiring the circuit. 3. The least likely problem, but it is easier to check than #2, is a bad breaker. There is no magical way to check this. Buy a new one, replace the old one, and see if that works. There isn't anything else that can be wrong. After checking all three things, you've checked everything on the circuit. If you still have problems a competent electrician will need to check the circuit more closely.
as an electrician i would first check the main breaker with a rated voltage tester for voltage i would first ckeck the meter side by placing one tester lead on one of incoming phases or wire and place second lead on the other phase or other wire. i should read 240, or 230, or 220 volts depending on where the taps are in the transformer. if not call the power company. if it does read any of them voltages i would then check the load side of the main breaker by putting my leads on one breaker and the one right below it generally every other breaker is a different phase again i should read 240 volts or close. if not the main breaker may be bad. if you know what breaker or circuit its on you could test it by placing one lead on the screw where the wire is and the other on the neutral or ground bar here you should read 120 volts or close if not breaker is bad. it maybe as easy as tightening the screw or screws so shut the breaker off first and then tighten.
You replace the breaker to see if that fixes the problem. There simply is no other practical approach. There exists testing equipment that will do this but it is much too expensive for general use.
An incomplete circuit is an open circuit; i.e. some part of the circuit isn't connected to anything.Or think of it like this: A circuit is complete when there exists a complete (or closed loop) path for the electrons to flow through it. Also known as a closed circuit. If this is not the case, then it is an incomplete (or open) circuit.