Obediah 1780 SC - 1849 GA was son of Jacob Light 1739SC-1818SC and Ann Russell 1737-1818.I don't believe you will find any native american blood there.Obediah married Mary Moore 1782-1849 in Jackson GA. Had several children:John Russell 1804-1858, Guilford Bird 1806-1883, Kindness Breedlove 1808-1892, Alfred M 1810-1884, Mary 1813-1896, Pleasant George 1815-1896, Permelia Ann 1817, Young Keller 1820-1902, Wiley 1822-1890 & Meredith (male) 1825-1901.Obediah seems to run in Light family as do several other family names.I believe Jacob was son of John Light Sr 1715 VA-Jun 28 1790 VA & Bridget Greene 1729-1790.
I do not know if I am related to these Lights or not but I have researched them to see if I can find my Anderson Light born 1827 TN.Still haven't found him but did find that some of your Obediah's descendents wound up here in Parker Co TX and are buried here.
Hope this info gives you a start on your Obediah. There are lots of Light research on here as well as Ancestry.com.(Paulette Light Jones)