Pleasant light that even after more than 3 months in operation, with daily. 8h. Continuous operation, even from the light output forth is convincing! A compact fluorescent lamp (bulb diameter: With me under 6 cm Lamp length: 12.6 cm) dürtfe which well be used in enclosed lamp housings because of their surprisingly low heat development! Simply top, however: As is known, let such lamps so after about 1 to 2 years up to about one third of light yield simply be ... life eight years? Of this I let myself probably surprise; o) Conclusion: unreservedly recommend *****!