Not to confuse you, but if you are concerned about the bulbs ability to show true colors, then check the spec for CRI (color rendering index). Look for a bulb with a CRI of 90 or more.

 

Would an Incandescent Bulb at 2,500 k be more Yellow and Darker to the Eye?

 

Would an Incandescent Bulb at 2,500 k be more Yellow and Darker to the Eye?

It would be more yellow but how dark it is will depend on its output not color temperature. It will affect colors in such a way as to make fewer distinguishable so that might appear to be a sort of "darker".

 

Halogen incandescent lights run at a sufficiently high temperature that they give off enough UV light so the fixtures they are in often have a glass plano lens to filter the UV.

 

LED lights | Philips lighting
Good luck............

 

Like Kodachrome, 5000K bulbs “give us the nice bright colors.” Anything containing blues will look far brighter than with a warm light.

 

I see 4000k as being bright white. 5000k appears blue (blue sky color?). I have never bought orange color "warm white" so I do not know its k numbers (2500k?).

2700K to match a standard filament lamp, 3000K to match a halogen.

 

An incandescent bulb like the sun gives a uniform spectrum, while LEDs can have a highly irregular spectrum, which distorts the colors. Halogen lamps have an optimal spectrum. They are more efficient than ordinary incandescent bulbs. If you want to preserve your eyesight, do not use LED bulbs.

 

LED lamps consist of a blue LED and yellow phosphor. More phosphor = less blue, more yellow = lower colour temperature. As the conversion of blue light to yellow light via the phosphor is not perfectly efficient, lower colour temperature = lower efficiency.
Green tends to be missing, unless you get an LED with 90% CRI, which has better phosphor.
LED efficiency falls with increasing temperature, phosphor efficiency increases.