For my purpose is not to use.

This bulb will be unusable well in most ceiling lights with exposed bulbs because of its enormous size and the relatively small lateral luminous area.
The bulb has fully-looked out at me from the lamp glass and was lit there only.
The other-there is the problem that the contact wires are much thicker than that of conventional bulbs, I could hardly plugging.
Therefore, you are useless for my purpose.
The luminous intensity and color, as with all 4 I tested sebson brighter and whiter than that of the compared bulbs with the same power.
The color is easy on the eyes in the day but in the evening a little too white (has no blue tinge, but seems relatively cool) That's why I use only one of the tested bulbs, behind a plastic shield.
The build quality of all 4 I tested lamps was very good.
For life course I can not say anything.