On the color temperature of indoor portrait photography lamp

Low color temperature light source is characterized by relatively more red radiation in energy distribution, which is usually called "warm light"; After the color temperature rises, the proportion of blue radiation in the energy distribution increases, which is usually called "cold light". The color temperature of some common light sources is: standard candle light is 1930K (Kelvin-day); Tungsten lamp 2760-2900K；; The fluorescent lamp is 3000 k; Flash 3800 k; The sunshine at noon is 5600 k; Electronic flash 6000 k; The blue sky is 12000- 18000K.

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The above is an explanation of color temperature from Baidu Encyclopedia.

The lower the color temperature, the warmer the color tone; The higher the color temperature, the colder the color tone.

So what you said in the tutorial is correct.