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Spectrum of Light

Jun 16,2022 | MEIJIU

Light and Your Cannabis Plant - Tips and Tricks for Optimal Cultivation


  • Light is essential for photosynthesis, which enables cannabis plants to grow and produce THC, CBD, and other cannabinoids.
  • Different light spectrums impact plant growth, morphology, and flowering.

Light Spectrum

A. Blue Light (400-500nm)

  • Promotes vegetative growth and helps produce strong, bushy plants.
  • Ideal for early stages of growth.

B. Red Light (620-750nm)

  • Encourages flowering and bud development.
  • Ideal for the flowering stage of growth.

C. Green Light (500-600nm)

  • Penetrates deeper into the plant canopy.
  • Supports overall plant health and can enhance photosynthesis.

Types of Grow Lights A. High-Intensity Discharge (HID) Lights

  1. Metal Halide (MH)
  2. High-Pressure Sodium (HPS) 
  3. Light Emitting Diodes (LED)
  4. Fluorescent Grow Lights
  5. Compact Fluorescent Lights (CFL)
  6. T5 Fluorescent Lights

Tips and Tricks:

Optimize Light Cycles

  1. Vegetative Stage: 18 hours of light, 6 hours of darkness (18/6 cycle).
  2. Flowering Stage: 12 hours of light, 12 hours of darkness (12/12 cycle).

Manage Light Distance

  1. Keep lights at an appropriate distance to avoid light burn or inadequate light coverage.
  2. Adjust distance based on the type of grow light and the plant's stage of growth.

Monitor Light Intensity

  1. Use a light meter to measure the Photosynthetically Active Radiation (PAR) levels.
  2. Aim for optimal PAR levels for each stage of growth.

Maintain Consistency

  1. Maintain consistent temperature, humidity, and light cycles throughout the grow process.
  2. Avoid sudden changes in light or environmental conditions to minimize stress on plants.

Utilize Reflective Materials

  1. Use reflective materials like Mylar or white paint to maximize light coverage and efficiency.
  2. Ensure an even distribution of light throughout the grow space.


  • Understanding the role of light in cannabis cultivation is crucial for optimizing plant growth and yield.
  • Experiment with different light spectrums, grow light types, and strategies to find the best approach for your specific growing conditions.