This Standard applies to all luminaires, with or without integral control gear, which are intended for use in Category V lighting schemes in accordance with AS/NZS 1158.1.1 and in Category P schemes in accordance with AS/NZS 1158.3.1.The requirements set out are, in general, based on engineering practices, construction materials and components that have, by long time experience in in-field application, been shown to realise the target service life of the luminaire. However instances can arise where departure from the aforesaid requirements may be justified, particularly in the case of those relating to materials. Where this is so it is referred to in the relevant text of the Standard, e.g. Clauses 2.4.1 and 2.5.2.1. However it must be noted that such departures can reduce the target life and this reduction can be significant. The range of lamp types and wattages utilized in the luminaires has not been specified because of the great range involved and because the lamp itself is not a determinant of the target service life of the luminaire. There is long-term experience of the reliability of many of the lamps and, importantly in the context of this Standard, of the associated control gear but limited experience in the application of some lamp/control gear combinations in Category V and P lighting schemes, e.g. fluorescent lamps and electronic ballasts. NOTE: Guidance on some alternative materials for lamps and control gear is given in Appendix A.