Straight from the BOOK!! Texas that is...

Artifical Light.......of any form that casts or reflects a beam of light onto or otherwise illuminates a game animal or bird may not be used as an aid to hunt, EXCEPT that battery powered scoping devices that project a light or dot only inside the scope and pin sight lights on archery equipment ARE LEGAL DEVICES....Non -regulated animals can be hunted at night with the aid of artificial light on private property... and I called TPWD just for claifiaction on this topic on the lighted nock issue, ITs perfectly legal here in Texas to use Lighted nocks.........