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All of the lighting requirements for residential buildings are mandatory measures. Therefore, lighting energy is not part of the energy budget for the whole building performance method, except as part of the standard assumption on internal heat gains that is assumed to be the same for all buildings. There are no tradeoffs allowed between lighting and other building features. The lighting requirements apply to alterations and additions (including replacements) as well as newly-constructed buildings. All new luminaires that are permanently installed must meet the Title 24 Energy Efficiency Standards requirements, but existing luminaires may stay in place.