The Zoo Med Coral Sun Lamp Bulb is a high intensity acitinic lamp that promotes growth of zooxanthellae algae, which is essential for the growth and well-being of all photosynthetic orals and invertebrates. This product is ideal for all marine aquariums and reef tanks. Warranty: Please click here to access warranty information. Features: Promotes growth of zooxanthellae algae; 6-month warranty Includes: 1 Bulb Intended For: Marine aquariums and reef tanks Size: 715 in/14W, 18 in/15W, 24 in/17W, 36 in/25W, 48 in/32W Capacity: Effective up to 10, 000 hours Zoo Med Coral Sun Lamp Bulb, Size: 36 in | PetSmart