Article I, Section 9, Clause 5 of the Constitution: "No Tax or Duty shall be laid on Articles exported from any State." I'm sure sufficient hand-waving will get the govt whatever it wants, but this one does seem fairly clear.
For the cost of a properly designed light, that ought to cost slightly if any more than a bad one, more of the light could be directed at the street, and less at the sky. Illuminating the sky isn't helping anybody.
Its a missing tear out page at the back of the Voynich Manuscript that says: "For more great titles from this publisher, send a self addressed stamped envelope to..."