Buyers must prioritize Luminous Efficacy (lm/W) and Battery Capacity (mAh). Ensure the lamp uses Lithium Iron Phosphate (LiFePO4) batteries, which offer over 2,000 charge cycles, significantly outperforming standard Lithium-ion. For indoor use, the Solar Panel Conversion Efficiency should be at least 19-22% (Monocrystalline Silicon) to ensure charging even in low-light conditions near windows. Additionally, verify the Color Rendering Index (CRI) is above 80 to ensure visual comfort in residential or office settings.