+ High light output
+ Low heat
+ Light color or temperature as bulb
+ Color rendering is not optimal but is an energy-saving lamp in order
+ Immediately usable light (about 60% of the final brightness)
== In detail
+ Anschaltverhalten
The Philips bulb has a brightness immediately after switching from an estimated 60% of the final brightness, or about 25W bulb at the beginning. After about 1.5 minutes, the final brightness is reached (the percentages are, however, subjectively, the eye so used to it after a short time at a brightness and light color, I do not stand with a stopwatch there). 60% initial brightness sounds once after not much, but there are also energy-saving lamps, which start in the first few seconds at almost 0% brightness and bring the 60% brightness after half a minute or longer. Who needs immediate brightness (z. B. hallway or staircase) and the lamps has only briefly at each, should rather use halogen bulbs or LED bulbs.
+ Light color
The light color is really warm white to distinguish it from a light bulb barely. The color reproduction is an energy-saving lamp in order. (We have in the nursery an energy saving lamp of Paulmann with quite worse color reproduction. As I get for playing a board game with dice every time a halogen floor lamp).
+ Brightness
The brightness is likely a little more than a 40 watt light bulb (matt) are.
+ Heat generation
The Philips bulb is even after hours just lukewarm. Of the 40W-light bulbs and the OSRAM 11W ESL I was used to that the bulbs are hot and the air stank even when changing, with the stench of the lamp and did not come to the bulbs. I was pleasantly surprised by the Philips bulb that barely heats the lamp, even after hours.
o Type
In the design you have to look natural, if it fits in the lamp. In my lamp has very good fit, but each lamp is different. Important addition to length and diameter is sometimes the beginning, where the bulb "thick" is, otherwise there is a surprise, if you want to turn the bulb into the socket and can not.
o life
10/2013: According to the manufacturer, the Tornado will hold an average of 8.000h. Our four bulbs which are used in the study, have now more than 20 months on average 4 hours burn time per day on the clock. None has so far failed or become noticeably darker.
03/2015: The first of the four bulbs is now defective. First they flickered suspiciously and then it took no more week, until they no longer were concerned. The lamp is every day at about 4 hours, about three years, would be about 4000 hours. According to the manufacturer, the lamp lasts 8000 hours. For this to early failure, there is a star deduction.
07/2015: The second of the four bulbs is now defective. 8000 hours should also not have under his belt.
== The whole story ...
For a ceiling lamp (Kubo of Fabas Luce, 4 flame) I was looking for a suitable energy-saving lamps. E14 socket was specified by the lamp and the bulb had rather short (max. 10 cm) to fit in the four matt glass beads.
OSRAM 11W warm white ...
I like to buy German products (where the actual place of manufacture so often deviates), so I had first the OSRAM DULUXSTAR Mini Twist E14 with 11 W in operation. The room was bright, but the pretty yellow light of Osram liked neither my wife nor me. One of the four OSRAM bulbs was clearly the extent of the green light and so forth otherwise, I did not like then twice. The yellow light is explained by the fact that Osram energy-saving lamps do not like the most energy-saving lamps have the 2700K "color temperature", but 2500K. That struck me until I had "test" looked more closely in the journal. Not that the OSRAM would be a bad bulb, but bright and quite yellow in the office room will not do.
... To OSRAM 11W tagweiß ...
In an Amazon review someone had raved about tagweiß, you just have to get used to something. So the warm white OSRAM OSRAM exchanged and taken tagweiß. But that was not, that's something tagweiß for companies, but in my view not appropriate for an office room in a residential building in which otherwise dominated the warm white light.
... Warm white to Philips 8W.
The OSRAM tagweiß so went back again and were exchanged in two cartridges, because the store does not carry Philips bulbs. The Philips ESL I had ordered through Amazon and with this I am very happy now.