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2. British Standards Institution, 1992. BSI. Degree of protection provided by enclosures (IP code). BS EN 60592: 1992
3. British Standards Institution, 1996. BSI. Road lighting – Part 9: code of practice for lighting for urban centres and public amenity areas. BS 5489-9
4. Chartered Institution of Building Services Engineers, 1992. CIBSE. Lighting guide LG06: the outdoor environment
5. Chartered Institution of Building Services Engineers, 1994. CIBSE. Code for interior lighting