Fairfax County supervisors on Feb. 11 approved updated outdoor-lighting rules that lower the permissible intensity and color temperature of some lights, and supported further efforts to shield local astronomical sites from light spillover, according to a report by the Sun-Gazette Newspapers.

The new rules limit most outdoor lights’ color temperature to 3,000 degrees Kelvin and reduce the maximum allowable brightness from 2,000 lumens to 1,500, said Carmen Bishop, senior assistant to the zoning administrator. Sports fields and courts may have lighting color temperatures of up to 5,700 degrees Kelvin.

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