id say cool leds

Some manufacturers have a color temperature adjustment, but these are not inexpensive.
http://www.mediadecor.com/led-downlights.html

Thanks for the kind words! We almost always recommend warm white for kitchens. The vast majority of customers get warm white and are very pleased with the results. You are more than welcome to order samples to test out the colors! Also, if you do order one color and decide you would like the other, we will always exchange them for you.

I would go with warm lighting in the kitchen, undercabinet, recessed ceiling, etc.. Somewhere near the 2600-3200K color temperature range. We incorporate dimmers on every light circuit in our projects and clients are always happy with them. Pictured is a xenon bulb (270 lumens @ 2,650K color temperature). I always incourage clients to go with LED lighting as the upfront expense is easily offset by all the benefits; the main being less energy consumption and almost no heat output.

I would go for warm LEDs, not so harsh.

In this case, 100% go with warm LEDs. It will make your home feel warm and inviting vs cold and sterile.

Some times it depends on where you are located and what type of light. I believe in California for example the light needs to be about 4500-5000k (white white) for permanent install fixtures. I may be off on that but I believe thats the standard now there as they have determined its healthier for you. Our standard fixtures (we only manufacture LED) come at 3000k, however you can request other Kelvin temperatures and CRI's. This resembles a warm halogen (as this is what people have become accustomed to and by far is what is most requested). Hope this helps.

What is the relationship between color temperature (k) and health?

@leslieandralph - Could you elaborate on your question a little more? Are you asking if there are direct correlations with color temperature of lighting and a person's health?

WARM always WARM in a house, unless you are lighting art , then you want to move more to a 3000k which is white... but warm is always more natural for us, b/c we are used to incandescent lighting.

LED is a manufactured source of light, it is not actually achieved by a burn temperature rather a diode that produces a color it is designed to reach, thus the color is in the eye of the beholder, you will find from vendor to vender, what is rated to be the same color temperature is not. say if you put a Feit LED next to a Ushio LED and they both say cool white and are the same wattage, i bet they are not the same color. So i suggest, that you talk to your contractor, ask him or the electrician to bring the two can options, or three if there is, have them pig tailed and plugged in so you can see it in your own home, hopefully you have a sample of your granite, and cabinets you can shine it on.

While the source kelvins are constant and measurable, Flair is absolutely right if you have two separate manufacturers and all they do to identify the color is mark them "Cool White" chances are they mean different things to different people.

I've actually seen bulbs from different manufacturers with the SAME 2700 kelvin temp and they looked completely different! One would offer a nice warm color, and others an odd greenish hue. It is definitely best to test out the exact bulb you want to use if possible.

Shakúff our LED's are not bulbs, they are Chips. Precise chips that are consistent and true to color where as SOME (lol) manufactures of LED lights use cheap materials and mislead their customers. But as with anything it's always good to see it first hand.

Why don't you try Daylight White LED? They are in between warm and cool. Just a thought. We get our LED lights from:

Creative LED Designs