Sold as 2 UNITS at $16.93 per unit. (1 unit = each.) Replacement bulbs in pack of 2. Will produce full spectrum light that mimics natural sunlight. No need for sun exposure to grow plants indoors. Fits Aerogarden3 SKU # 7208812, others, Aerogarden6 and Spacesaver6. Manufacturer number: 970914-0200. SKU #: 7216971. Country of origin: China. Distributed by Aerogrow International, Inc.