... hours4.High center intensity, 2 times higher than normal spiral lamp, about 6 times higher than U shape lamp5. ... and elegant appearance7. Advantageous performance, advanced and creativeMain Advantages1.full spiral shape options2.strict raw material inspection 3.100% aging line ... , Shops, Department Stores, Clubs, Restaurants, Hotels, Supermarkets half spiral shape energy saving bulb 5w -15w 6500k