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I am thinking that I may use LEDs in kitchen under suspended wall units (were heat is less welcome, since you end up working very close to them), and use halogen on the ceiling...

There is no such thing as a type of light bulb which is good for everything! All lighting technology has its drawbacks these days. The best lighting designs use a mix of technologies to good effect. I think your Kitchen idea is a good way to go about things.
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Hussein