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Conwy County Borough Council Draft Unitary Develop
http://www.conwy.gov.uk/English/2council/planning/policy/devel_plans/udp/udp_intro/Chapter06.pdf
Includes an example of a relevant planning policy (#13). (PDF) (2001)
National Assembly For Wales Planning Index
http://www.wales.gov.uk/subiplanning/toc-e.htm
Latest Wales-wide planning policy (includes latest policy on pollution including lighting).
Planning Policy Wales
http://www.wales.gov.uk/subiplanning/content/planningpolicy/planningpolicy-e.htm
Links to HTML and PDF versions of the policy and related information. Lighting is dealt with in various section especially 13.13-13.15 of the policy. (2002)