When sourcing Solar LED Garden Lights, you must prioritize the Battery Type, Solar Panel Efficiency, and Lumen Output. Look for Lithium Iron Phosphate (LiFePO4) batteries, which offer a longer lifespan (2,000+ cycles) compared to standard Li-ion. Ensure the solar panels are Monocrystalline Silicon, as they provide a higher conversion rate (up to 21%) than polycrystalline alternatives. For brightness, verify the Lumen-to-Watt ratio; high-quality chips like Cree or Bridgelux typically deliver 120-150 lm/W, ensuring efficient energy use.