DO NOT BUY IKEA DIODER!
This really bites and I'm in the same predicament searching for a better alternative. I found a decent one on ebay, unfortunately, the wires are short and I've read somewhere that they burn out quickly.
I've had the older Ikea dioders for several years now and I even leave them on all night when I come in from work, and leave them on all day on weekends and they're still bright and has a nice bright cool white lighting, but unfortunately, IKEA switched manufacturers and the ones they sell now have a piss yellow tint to it.
If you must get one from Ikea, I recommend getting the Dioder that you can change colors cause you can play with the settings and I've left mine on a bright setting but it has a blue tint to it, much more appealing though than than the burnt yellow from the new dioder.