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The Perfect Spectrum Matching the Sun? CCT vs CRI

May 26 2023 – Danielle Daly

The Perfect Spectrum Matching the Sun?  CCT vs CRI
The Perfect Spectrum Matching the Sun? CCT vs CRI

This blog post, originally created on Instagram, delves into the fascinating realm of lighting and the quest for the perfect cannabis spectrum. While it's not easy to declare any single spectrum as "perfect," the Mint White Series (using Samsung EVO diode) comes remarkably close by closely matching the kelvin temperature of daytime sunlight. 🌞⁣⁣

As we strive to find the optimal spectrum for cannabis growth, the Mint White series aligns closely with what nature intended. ⁣

Below, you'll find essential information to help you understand the spectrum's significance:

Kelvin Chart and Spectrum Comparison:

  • We've attached a Kelvin Chart for your reference.
  • Following that, we've provided data comparing the 8 Bar + 6 Bar integrated sphere data of the Mint White series with that of Fluence 2i for visual comparison.

Understanding CCT and CRI:

  • When it comes to plant growth, two key factors to consider are CCT (Correlated Color Temperature) and CRI (Color Rendering Index). These factors have different impacts on plants.⁣⁣⁣⁣ ⁣⁣⁣⁣ CCT (Correlated Color Temperature):
  • CCT refers to the color appearance of light and is measured in Kelvin (K).
  • It indicates the "warmth" or "coolness" of light.
  • Lower CCT values (e.g., 2700K-4000K) are considered warm or yellowish, while higher CCT values (e.g., 5000K-6500K) are cooler or bluish.
  • CCT plays a crucial role in regulating photoperiodism and controlling different plant growth stages.⁣⁣⁣⁣

CRI (Color Rendering Index):

  • CRI measures a light source's ability to accurately render colors compared to a reference light source. It is rated on a scale of 0-100, with 100 indicating the best color rendering.
  • While CRI is important for human perception of colors, it holds less significance for plant growth.⁣⁣⁣⁣
  • What matters most for plant growth is the specific spectrum of light wavelengths, particularly those within the photosynthetically active radiation (PAR) range (400-700 nanometers). ⁣⁣⁣⁣

In summary, CCT is a more crucial factor for plant growth as it directly influences photoperiodism and different growth stages. CRI, while important for human visual perception, takes a back seat when it comes to plants. When selecting lighting for horticultural purposes, it's essential to consider both CCT and the specific light spectra (wavelengths) required for photosynthesis, rather than relying solely on CRI.

Stay tuned for more insights on this fascinating topic as we continue to explore the world of horticultural lighting. 🌿💡⁣⁣⁣⁣

1 comment

  • Jason Bird: June 10, 2023
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    I have an an OpticLED Slim750S and and already have their V2 controller. Will any controller work or does it have to be a certain brand?

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