Neb. Rev. Stat. § 37-1236

Every white light prescribed by sections 37-1233 to 37-1235 shall be of such character as to be visible at a distance of at least two miles. Every colored light prescribed by sections 37-1233 to 37-1235 shall be of such character as to be visible at a distance of at least one mile. The word visible in this section, when applied to lights, shall mean visible on a dark night with clear atmosphere.