Good idea with the dates winnie. I have done that over the last 10 years on my normal filament lamps and the CFL lamps.

Haven't had any faillures yet, some of my lamps have hour meters on them and have done between 206 and 13499 hrs. (highest reading).

Ok the ones we use are the 230 V 50 Hz ones. most are Philips brand.

The product of rotation, excitation and flux produces electricty.