Key Specifications/Special Features: Half spiral series Power: 5, 7, 9, 11, 13, 15, 18, 20, 22, 24, 26, 55, 65, 75, 85W Features: Low light wane, maintain over 80% luminous flux after 2,000 hours continuous lighting Lifespan is up to 8,000 hours -- the lamp tube comes with protected film and dual volute filament Super high frequent work, high conversion efficiency, and no interference Wide range voltage input, safe, and reliable operating range (-25% - +15%) Can be customized to customer's specifications