Which of the following options is best for reducing energy bills in a high-rise building?

Delamping or relamping is an effective strategy for reducing energy bills in a high-rise building because it involves reducing the wattage of lighting fixtures or upgrading to more energy-efficient lighting options. This not only decreases the energy consumption associated with lighting but can also lead to lower heat generation, which reduces the need for air conditioning.

In high-rise buildings, where lighting can account for a significant portion of total energy usage, even small changes in lighting can have a substantial impact on overall electricity costs. By using energy-efficient bulbs, such as LEDs, or by adjusting the number of lights used in common areas, buildings can achieve significant savings.

Effective lighting management also enhances the overall environment of the building, demonstrating an immediate financial benefit as well as an improvement in tenant comfort, which may reduce turnover and further lower long-term costs associated with vacancies and renovations.

Other options, while beneficial in their own right, do not target immediate lighting energy costs as effectively as relamping, which specifically addresses one of the most controllable aspects of energy usage in a building setting.