In a typical residential or commercial lighting installation, _____ energy is wasted by obsolete equipment, inadequate maintenance, or inefficient use.

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BlackTom AI · Accepted Answer

The question asks about the share of energy typically wasted in lighting installations due to obsolete equipment, maintenance gaps, or inefficient use.
Option 1: '50 % or more' — This conveys a high level of energy waste, which aligns with industry observations that outdated luminaires, poor maintenance, and inefficient lighting practices can lead to substantial waste in many buildings. It reflects a broad estimate rather than a precise figure, making it plausible as the correct choice in a general knowledge context.
Option 2: '25 % or less' — This implies a relatively small amount of waste. In reality, when you factor in obsolete fixtures, misaligned lighting, bad lamp schedules, and lack of controls, the waste is typically more than a quarter in many installations, especially older or poorly maintained ones. This makes the statement overly optimistic and less accurate as a general rule.
Option 3: '50 % or less' — While this softened bound captures a range that could be true in well-optimized systems, the phrase 'or less' does not acknowledge that, in practice, many installations exceed half of potential energy use due to inefficiencies. It risks underestimating waste and misrepresenting typical conditions in a broad sense.
Overall, the reasoning behind these choices rests on understanding that energy waste in lighting often scales with equipment age, maintenance frequency, and control effectiveness. Older or neglected setups tend to push waste toward higher percentages, while newer or well-managed systems perform more efficiently, but the question emphasizes the general tendency across typical installations rather than best-case scenarios.

EGEE 102 (SP25): Energy Conservation for Environmental Protection FINAL EXAM

In a typical residential or commercial lighting installation, _____ energy is wasted by obsolete equipment, inadequate maintenance, or inefficient use.

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