I used to keep the lights on 24/7 in my tanks. Snakes didn't care at all. They would still only come out late in the day and when hungry and still hide most of the day!!!
0.3 Normals (Coilette, Athena and Mary Jane)
1.0 Pastel (De Sol)
1.0 Spider (Zeus)
1.0 Mojave (Prometheus)
0.1 Brazilian Rainbow Boa (Stella)
0.1 BCI (Kiyoko)