That's OK if you can put up with lights of different colours. I wouldn't be allowed to get away with that so I've always bought a couple spares when replacing lighting in a room.
I think one of the easiest and greatest single savings I made years ago was swapping to LEDs. I don't have failure every 3 years any more, can't think of the last time one went - though that was my experience in their early days, and/or with the cheap ones. They were an odd greenish sort of colour IIRC.
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