Can I replace a ceiling light fixture with a higher wattage one?
Yes it could matter your best course of action would be to determine all loads connected to that circuit and potential loads to see if the circuit will be likely to handle the additional load. Connected loads will most likely be other lights. You can either identify them and add the wattage or better turn them all on and check the amperage that breaker with a clamp on ammeter then add any general use outlets on that circuit at 180 watts each. A 15 amp circuit should not have more than 12 amps (1440 watts) continuous load a 20 amp circuit no more than 16 amps (1920 watts)