1. Many LED bulbs for household use and the normal power grid stink of plastic / flame retardants, if you let it burn longer, until they are warm. In small rooms (there I test them much) interferes with the fast, especially since it's very unhealthy for sure. This did not smell, is indeed almost entirely of glass and metal.
2. To date, a small start-up delay, this most (LED / energy saving) bulbs were not here.
3. So far, the color behavior of the LEDs left to be desired. There were variations on red, yellow, white and green. This one has the desired light yellowish tone, which is perhaps more than 2700K 2600K direction. TIP: If that is too yellow, it may, for example, with "E27 filament LED FGS 4W (40W replaced) / 400lm / 3000K (warm white)" try.
4. Power consumption: 4W for 440Lumen ("40W"), this lamp is top.
5. Durability: 20000 hours have a very good value. Whether this value is reached, I do not know yet, but I will report.
6. Significance: Glass and metal are now times unbeatable!
7. Nostalgia: Who depends on the light bulb, can be accessed here. Only the color is a bit yellow, so
8. Design: Most people find top chic.
9. Brightness: rather slightly lighter than you'd expect for the specified lumen / wattage.
Disadvantages:
1. Non dimmable. Of course, is only a disadvantage if you need that.
2. The natural light spectrum as a whole does not meet the sunlight, nor the old bulb, but felt like at least when the light bulb (a little yellow).
