De lamp will light immediately, not as energy-saving lamp. I'm very satisfied with the quality of light that lit the lamp very bright and gives off a warm light, the 40 watt bulb it replaces hardly unterscheiden- and at 4 watts. The light is low for about 5 seconds after being shut down almost imperceptibly determine yet afterglow geringers, that is - in addition to the somewhat high price - the only reason why I give only 4 stars.
I'm very satisfied with the bulb, and it can only recommend it!