My first job was a ‘sparks’ in a theatre complex. Every Monday I walked round the building doing the ‘lamp round’ – checking for lamps that had blown (Bulbs, I was taught, are something you put in the ground). Different lamps had a different life, by in large they lasted the x hours they were rated for.
At home and in my workshop I’ve been moving over to ‘energy efficiency’ lamps. However, most (made in China and elsewhere) don’t last nearly as long at they claim. So the cost of replacement far outstrips the energy saving (notwithstanding the carbon emissions of getting them here).
While I don’t’ like the esthetic of the radiated light spectrum of the compact fluorescent lamp (CFL) I’m incandescent with rage that the traditional light globe being phased out. My advice — stock up while stocks last.