8 of these energy-saving lamps I have been 3 to 4 years in 4 ceiling lights in operation. Replace the 2-gang installed 40 watt E27 bulbs. With 12 watts consumption, they lead to a saving of 70%. With the values 725-740 lumens to get into the area of a bright 60-watt bulb, so it has another 50% more light output compared to the 40 watt light bulb. So far, no lamp has failed, although the rooms are used every day. The extremely short Vorschaltzeit is obtained as before.