I never got headaches from mine, but the light did seem a bit blue, at first. This was simply due to the juxtaposition of the new light and incandescent bulbs, however. Compare the light to daylight or a fluorescent bulb and the blue skew disappears.
As far as the headaches are concerned, how close is your bulb to the workspace? What are the usual lighting conditions before you start working? Daylight bulbs tend to put out a lot of very bright, white light, so I'm wondering if you aren't simply overloading your eyes. Walking into broad daylight from a dimply lit building is liable to give you a headache, as well. Just a thought.
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