CFLs vs. long tubes
This is not exactly "wiring", but it seems like some posters here will know the answer. What is more efficient, CFLs or old-fashioned, long fluorescent tubes? Some spot-checking indicates that you get significantly more lumens/watt with T8s than CFLs.
Then there is the maintenance factor. With a CFL you just chuck it if it breaks. With tubes, you have to figure out if the tubes or the ballast is bad, and replacing a ballast can be relatively time-consuming. With CFLs getting so cheap, I wonder if I should replace troffers and strips with fixtures that take CFL bulbs. I have a ton of 4' and 8' tubes in my house and (especially) garage. Some need work now and all will in the next several years.