We live in Sansai, does anyone have a telephone number for the people who replace lamps in the Moo Baan

San Sai is very large and contains numerous Moo Baans so you are not going to get much response unless you can be specific. Usually people talk with their "Puu Yai Baan" about local issues.

Surely your Mooban has someone responsible for its upkeep unless its unusually small,ask a neighbour.

Moo Baan can mean housing development or village as in traditional farming village, which one is the OP referring to?

As far as I know, a gated community takes care themselves of street infrastructure. Guess you just go to the office of your gated community...

Otherwise your tambon office will take care of street lighting if it's that important to you.

many moobaans in Sansai have no management at all. offices and guard kiosks have been deserted for many years. go to the tessabaan on the way to the post office. they take care of street lamps, trash, removal of beehives and so forth.

street lighting all over the city seems to be iffy right now. huay kaew and canal road tonight had hardly any. was weird.