Comprehensive and Detailed Explanation From Exact Extract:
Designing lighting systems based on initial lamp lumen output (the maximum light output when lamps are new) without accounting for lumen depreciation (light loss over time) typically leads to increased number of lamps or fixtures to compensate for future light loss, ensuring adequate illumination throughout the system's life.
This approach does not directly affect glare (B, D).
It does not decrease the number of lamps (A); it often increases them for safety margin.
References:
ARE 5.0 PPD - Environmental Conditions and Context, Lighting Design
The Architect's Handbook of Professional Practice, 15th Edition - Lighting