NH Law on Lighting:
http://www.gencourt.state.nh.us/rule.../saf-c400.html
Saf-C 403.14 Time for Lights. Proper lighting, as required in Saf-C 403.15 and Saf-C 403.16, shall be displayed between sunset and sunrise. Lights shall be lighted at such times and no other lights which might be mistaken for, interfere with, or distract from, the prescribed lights shall be exhibited.