Color Temperature

Last updated: August 30, 2018

What Does Color Temperature Mean?

In indoor gardening and horticulture, the color temperature designs cool or warm hues and is usually measured in Kelvin units. An adequate color temperature is crucial for adequate plant development and growth. While grow lights are mainly used in indoor gardens, they can also be used in the outdoors during colder winter months.


Maximum Yield Explains Color Temperature

The color temperature is adjusted to provide a light spectrum that mimics natural sunlight. In some cases the temperature needs to be readjusted in function of the plant’s specific needs and condition. Most gardeners opt for the following temperatures:

  • 4200K + range: these bulbs have a pronounced blue hue that is similar or more significant than the natural blue tint in sunlight.
  • Between 3500k and 4100k: these bulbs have a cooler white hue.
  • 3500k or lower: these bulbs have a reddish orange hue.

Seedlings usually require a higher temperature, otherwise, they may become leggy and weak. However, it is important to avoid placing the bulbs too close to the seedlings. In most cases, adjusting the grow lights 2-3 inches above the plant’s foliage can provide sufficient energy.


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