OSRAM LUMILUX T2 FM Extra miniature fluorescent tube - 11W - 620lm 4100K 8000h - ø7 x 420mm - Energy Class A - Base W4.3x8.5d - 7mm fluorescent tubes, base W4.3 x 8.5 d. Product features: Good average lifespan (with OSRAM electronic ballast). Tube diameter: 7.0 mm. Product advantages: Extremely economical. Good light quality. Excellent luminous flux. Ultra-thin compact fluorescent lamp. Areas of application: Offices. Museums. Shops. Supermarkets and department stores. Industry (e.g., furniture industry). Restaurants. Technology/Accessories: Only for use with electronic power supplies.