Special conditions. Floodlighting is prohibited unless specifically approved by the Planning Board and is directed away from the roads, drives or neighboring properties. Ground-mounted illumination of buildings or features shall be permitted only when light sources are concealed from view when the building or features are deemed significant for illumination, and with approval of the Planning Board. Flashing, blinking or moving lights are prohibited. Holiday lighting during the months of November through January is exempt from this chapter as long as there is no objectionable glare or trespass. Sports lighting may be permitted, including waiver of some conditions, after approval by the Planning Board and assurance that there will be minimal impact on passing motorists or neighboring properties. Light curfews are required in all parking areas of more than four vehicles serving commercial or industrial purposes, and may be accomplished either by reducing lamp output, or by turning off selected lamps, but shall not require reductions to less than 0.2 FC measured at ground level. Security lighting shall comply with standards for intensity trespass and glare, but need not be within opaque housings. Lighting lawfully in place prior to the date of these regulations shall be permitted to continue but significant site modifications shall require conformity.