Changing Bulbs
I hate changing the light bulbs in my front room. No particular reason why, it just irks me. Last year I had extensive electrical work done on my front room to ensure that I wouldn’t need to change my bulbs unless it was absolutely, positively necessary. However, for reasons of overall efficiency, I ensured that every other electrical appliance in my front room was unaffected by the extensive electrical work.
What did I do to make my light bulbs last longer?
I’d guess that you cut the power to the lights, and only the lights. Hard for lights to burn out if they can’t be turned on.
nope
Installed flourescent lighting?
I’m not sure of the answer to your riddle, but I know this much: I haven’t done any electrical work on any of my rooms, and I only change my bulbs unless it is absolutely, positively necessary. In other words, unless they burn out AND it is dark AND I plan on doing anything in the room in question that requires light, I don’t change it.
Sounds to me like you wasted a lot of money (If you spent more than $.01)
You had all the exterior walls removed?
Whilst I like Verrain’s answer, it is not right. Neither is anyone else.
Needlessly oblique & cryptic hint: Try to think General 
You put inductors in the wires - this eases the lights both on and off rather than the abrupt shift that usually occurs and makes them last longer.
Either that or you decided to use oil lamps instead - never need to change a lightbulb then…
So what did you do?
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I changed the wiring so the bulbs ran on direct current rather than alternating current. That made them last a little longer.