When sourcing 24V DC LED garden lights, prioritize IP65 or IP67 waterproof ratings to ensure durability against rain and dust. Look for high-quality LED chips (such as Cree, Osram, or Bridgelux) that offer a luminous efficacy of at least 100 lm/W. Additionally, ensure the housing is made of die-cast aluminum with anti-corrosion coating to prevent rusting in outdoor environments, and verify that the color temperature (CCT) meets your project needs, typically 3000K for warm landscape lighting or 6000K for security purposes.