This is called a lamps Color Temperature.
Cct lighting chart. CCT is measured in Kelvin K which is similar to degrees in Celsius. A warm light is around 2700K moving to neutral white at around 4000K and to cool white at 5000K or more. Warm light sources such as incandescent bulbs.
And in short the higher the Kelvin rating expressed in K the whiter the light will be. The CCT of white light represents an equivalence to the radiated heat flux from incandescent lighting and is measured in kelvin K. Choosing the CCT in your light fixture can change the ambiance in the installed application.
Color temperature is a simplified way to characterize the spectral properties of a light source. It is a measure used to find the quantity of light used for viewing in Kelvin scale K. Both fluorescent lights and LED lights light emitting diodes fall under this category and thus are evaluated using CCT.
Closely flanking the target chromaticity. Other colors may be added to enhance the available color spectrum and ensure good color. BrightCool Light Warm Light.
Because color temperature is hard to photograph accurately mostly due to white balance we recommend referring the the first color temperature chart above for reference. Correlated color temperature is a specification used to describe the dominant color tone for non-blackbody light emitters such that they can be accurately compared and contrasted with those light emitters that do approximate. Orion offers product in 3000K 3500K 4000K and 5000K to let you choose the desired lighting effect for your environment.
Mathematically however it is possible to calculate a CCT value for light sources that are not even close to being white - for example a saturated green LED from an RGB system can have a calculated CCT of approximately 7000K even though its qualitative color appearance. Color and CCT Control. The CCT of a light source given in kelvin K is the temperature at which the heated black body most closely matches the color of the light source in question.

