Lighter string buzz

[LARRY KLOSE]

After many years of playing my Shanti SF with medium strings, I tried a set of lights (.012"). I like the feel but I'm getting a buzz from the low E string and a littlemid-board buzzing further up the neck on the wound strings. I'm thinking I need a little more relief. It was pretty flat before with no buzzes, but now it's just a couple of thou. Shoud I be looking to tighten the tension rod a smidge or shimming the saddle slightly?

[Antonio Cotichini]

It is normal, if you change the strings with a minor diameter, that the neck back-bows a little, because of less tension, and this can generate some buzzing.
Try to loosen the truss-rod a quarter of turn and wait a few days to allow the neck to settle. If it's not sufficient, turn another quarter. Each time re-tune the strings at pitch and wait. If you'll have too much relief from the string and the 6th fret (take the relief keeping fretted the 1st and 12th fret), you can rise a bit your saddle, but tight the truss rod as it was before.
The best advice, anyway, is to have the job done by an expert.

[Greg Mirken]

Antonio is right that you should loosen (not tighten) the truss rod first. Less than a quarter-turn may do it. As I understand the neck is practically dead-flat with lights- what does your action measure at the 12th fret?

Remember light strings will buzz more easily than mediums even after the action is equalized, because the strings move further with the same attack. You can lighten your touch, and learn that a little buzz is an acceptable and normal guitar sound.