I bought two of these this afternoon for 9 euro each, one is in the standing reading lamp now, the other is no more... What I wanted to find out is if the leds+optics could be used to build a lantern but after the breakdown that appeared not possible because the leds are in two strings of 12, working at the too high voltage of 36V (I measured it with the DMM).
What's leftover for me to report is the impression and breakdown of the bulb. It is a pretty standard size E27 type bulb with plastic cover and a white painted aluminium base (=heatsink). The bulb puts out 600 lumen of 2700K >87CRI light that goes mainly sideways (therefore my interest for building it into a lantern). 87CRI is more than most household bulbs, I'm really pleased that IKEA abandoned the standard 80CRI with this bulb. It works very well in the reading lamp (that has a big shade that directs the light downward), very pleasant light and it gives softer shadows than the halogen bulb that it has replaced.
The teardown was a challenge because of tough plastic-kit and potting stuff, and resulted, as said, not in the desired lantern parts :-( I am not educated in electronics so I give you just the pictures without commenting on them, it should be ok I assume. That's all, I hope you find it useful.
Pictures:
_____________________________________________________________________
May 11th 2016 Update
I was in IKEA this afternoon and they appear to have a new version of the E27 600 lumen household bulb, for under 7 euro now, different specs, different construction, different optic. So I bought one. Some new claims: 70lm/W (was 60lm/W), 90+CRI (was 87+CRI). I tried it in the reading lamp instead of the former 87CRI version that was in there, and it is not that the difference is obvious. I took a picture of the light of the old and new bulb, the new bulb still has a ripple in the light output (not visible but it appears in the photo's), the new ripple is a bit larger but also smoother.
Nice to see that IKEA is still ahead of most sellers in light quality!
Left the old bulb, new bulb on the right
The old bulb in the reading lamp:
The new bulb in the reading lamp: