Light sources have a spectrum. In some cases it is narrow, and in others wider. The sun, for example, emits through the entire visual spectral band, as well as UV and IR. tungsten and tungsten halogen are hot emitters with various spectral bands generally characterized by their apparent color temperature. The sun's spectrum is close to that of a 6000K (degrees kelvin) black body, whereas tungsten lights may be 2700K and tungsten halogens up to 3300K. The latter color temperatures are considered lower than the sun color temperatures, but are called warmer. Arc lamps that are spectrally broad may fall into the same color temperature range as the sun, but depending on line structure from the gasses used and the pressure that they are running at, may appear redder or bluer than the sun. Note that as these thermal sources are turned down with a dimmer, they become redder (warmer color) even though they are getting colder, physically. Now, getting to light emitting diodes, there are two types that I'm aware of being used for illumination (excluding variants). One type emits mainly at a single color, but because they are not true laser sources, this color band may be somewhat wide. Combinations of these sources may be used to try to match the tristimulus diagram of human eye response and look like a black body emitter at some color temperature. High color temperatures are considered colder because they have more blue; lower temperatures are considered warmer because they have more red. Note that this is referring to color temperature, and not LED physical temperature. The Cree LR4s had a scheme for re-balancing the color temperature as the LEDs aged. As I recall they were available in two different color temperatures for different applications. A clothing store, for example, might want a higher (colder) color temperature for interior illumination, whereas a kitchen might prefer something warmer (lower color temperature). (No one should be embarrassed if confused by this contradictory nomenclature.) Cree provided me a (proprietary) spectral chart that showed that their color spectrum was broad, but not particularly close to matching a black body spectral diagram. To avoid any post construction complaints I bought a single lamp and tested it against my soapstone and granite to ensure that the green highlights in each were being properly illuminated to provide a pleasing color balance when illuminated with the warmer LR4 option. The second type of LED source uses a deep blue or UV LED (or array of LEDs) to illuminate a phosphor or a combination of phosphors intended to emit a particular "whitish" color temperature. These phosphors tend to look yellow when viewed with the lamp off. By choosing the phosphor chemistry, and possibly over coating with filters, different color temperature sources are created. The goal is to know what color temperature one wants before specifying the particular lights to be used. If you want a tungsten halogen color temperature, specify 3200K - 3300K. For regular tungsten, 2700K - 2800K is good. Higher values toward 4000K will be bluer and more blue sky matching. As an aside, LG was able to cut the cost of organic LED (OLED) TVs by using all white (phosphor) blue-emitting OLEDs with red/green*/blue filters rather than the more difficult to manufacture sets of red/green/blue single color LEDs. kas *maybe yellow, I'm to lazy to go look

Thank you all for your comments. On top of being super busy w/ everyday stuff, I'm also battling the worst spider mite problem I've ever had. Aside from that, my light arrived yesterday, and I unboxed it today. And yes Martin, it's extremely bright! I'm glad I didn't opt for the 2000W model lol. My Mom was over, and before I plugged it in, She said "Are you sure that's big enough for what you need?", then I flipped the switch, and we were both blown away. Here's a couple of pics, one w/ a flash, and one w/o. I'm finishing up sterilizing one of my flood trays now, so I hope to get this thing up & running tomorrow. Rob

@Patricia Colwell Consulting, thank you, contractor has said the same-just wait and get used to it. I'm very light sensitive, always have been, so LED has been tough for me-but I don't want a yellow glow, so good to know on that! Maybe I'll try 2700 in living and 3000k in kitchen, out kitchen is very white, so I don't want it to feel too sterile. Right now we just have old canned bulbs in there and the light is fine, actually quite bright (some of them might be LED bulbs now that I think about it). Thanks!

MR16s are low voltage lights that require an external transformer. I personally have never seen them in a house. I have seen GU10, but never seen them as general kitchen lighting. I have one rental that has GU10 in the hallway and it is pain to even find a replacement. I would have to see how this would look in a kitchen. Do you have any links to images of this look in a kitchen? Also, I have gone back and forth on the 4" vs 6" Cans. I have always used 6" cans in the past unless it was for spotlighting. Do you have any links to articles talking about this issue? I will probably go and look at some of the new homes and see what they are using and how it looks. Maybe I can get 5" Cans as compromise, but I don't see them as often.