Don't mean to be a twit, but I keep seeing LED lights that give off 3000 Kelvin light described as "full spectrum". My understanding from other disciplines that I work with is that 5000 Kelvin is considered full spectrum, as it more closely mimics real sun light. More on forum.growweedeasy.com

"White" lights are full spectrum lights by definition because white light contains all colors of the visible light spectrum in some sort of ratio. A beam of light from a white LED should split into a rainbow pattern when passing through a prism, where as the red or blue light from the colored diodes in many "grow lights" will not break down into other colors through a prism. The difference between the different color temperatures in white LEDs describes the ratio of blue vs red wavelengths in the light. Lower temperatures like 3000k - 3500k have a higher ratio, or saturation of red vs blue wavelengths, and higher temperatures like 5000K - 6500K have a higher saturation of blue vs red light compared to the lower k values. More on reddit.com

First I thought you meant tulip bulbs and was confused as hell like how is 5000 tulips supposed to help plants grow.. More on reddit.com

The Kelvin scale is a temperature scale in which its zero point is absolute zero (-273.16o C), the temperature at which all thermal motion stops. So what does a temperature scale have to do with colors? Well, a black body radiator emits a color that varies with its temperature. A black body whose temperature is below 4000 K appears more reddish in color, while one whose temperature is above 7000 K appear more bluish. For reference, 4000 K is 3727o C (6740o F) - that's pretty fucking hot. This color temperature scale in OP's post is called the correlated color temperature (CCT) and is used in photography and image projection. It has also become useful when defining the color emitted by light bulbs. More on reddit.com