Are you looking for census records? I found a few. I did not find a William S Bright in 1900 though. There were four there. Three were too old to be his parents and one was only 20 so he would have been to young.
BRIGHTHANNAH 50 F W TN TN BLOUNT5-DIST1900
BRIGHTJAMES 53 M W TN TN BLOUNT5-DIST1900
BRIGHTLIZZIE 20 F W TN TN BLOUNT5-DIST1900
BRIGHTWILLIAM W 50 M W TN TN BLOUNT17-DIST1900
I did not find him there in 1910 or 1920 either. Do you have any other information that might help? Who were his parents? In 1880 there were 21 Brights in Blount Co. I would need his fathers name to locate the right family. I don't subscribe to Ancestry so have to get the census from Heritage and they mostly list heads of households. On this website http://www.tngenweb.org/blount/census.htmhttp://www.tngenweb.org/blount/census.htm there is a lookup for the 1890 Tn census. Give that a try.