Natural Light Only

No unauthorized person shall use or direct the rays of a spotlight or other artificial light, or automotive headlights, for the purpose of spotting, locating or taking any animal within a national wildlife refuge national wildlife refuge
A national wildlife refuge is typically a contiguous area of land and water managed by the U.S. Fish and Wildlife Service  for the conservation and, where appropriate, restoration of fish, wildlife and plant resources and their habitats for the benefit of present and future generations of Americans.

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or along rights-of-way for public or private roads within a national wildlife refuge.

Citation
50 CFR 27.73
Related Programs
The U.S. Fish and Wildlife Service manages an unparalleled network of public lands and waters called the National Wildlife Refuge System. With more than 560 refuges spanning the country, this system protects iconic species and provides some of the best wildlife viewing opportunities on Earth.