Do Leopard Geckos Need UVB? Comparing Ferguson Zone 1 Lighting vs Vitamin D3 Powder

While Leopard Geckos (Eublepharis macularius) are crepuscular and can survive on dietary Vitamin D3 powder supplements alone, recent veterinary research demonstrates clear physiological benefits from low-level linear UVB provision.

Ferguson Zone 1 Lighting Guidelines:

• Leopard Geckos fall under Ferguson Zone 1 (UVI 0.5 to 1.5).
• A low-output linear T5 lamp (such as an Arcadia ShadeDweller 7% or 2.4%) positioned 10 to 12 inches above the basking zone provides safe, natural sunlight levels.
• Geckos utilize 'cryptic basking' by exposing just a limb or tail from a hide during dusk to synthesize Vitamin D3 naturally. This supports proper calcium metabolism, bone density, and natural circadian sleep/wake cycles.