Color temperature কী?

The color temperature of a white-ish source is the temperature of the incandescent body whose hue its light matches: candle $1800\,\mathrm{K}$, incandescent bulb $2700\,\mathrm{K}$, halogen $3400\,\mathrm{K}$, midday sun $5500\,\mathrm{K}$, overcast daylight $6500\,\mathrm{K}$. It is a color label, not a thermometer reading — a $6500\,\mathrm{K}$ LED runs at room temperature — and vocabulary runs backwards: low color temperature reads “warm” orange, high “cool” bluish.