When evaluating light bulbs, you must look beyond the initial price tag and focus on Luminous Efficacy (Lumens per Watt), which determines energy efficiency. For LED bulbs, ensure a minimum of 100-120 lm/W. Additionally, check the Color Rendering Index (CRI); for commercial or retail spaces, a CRI > 80 or 90 is essential for color accuracy. The Rated Lifespan (e.g., 25,000 to 50,000 hours for LEDs) significantly impacts the Total Cost of Ownership (TCO) compared to cheaper incandescent or halogen alternatives.