Grow Room Setup & Equipment
Reflective Material
Reflective material is a surface used in grow spaces to bounce light back onto plants, increasing light efficiency and coverage.
What Reflective Material Does in a Grow Space
In cannabis cultivation, reflective material refers to wall coverings or surfaces designed to reflect light back toward the plant canopy instead of allowing it to be absorbed or lost. By redirecting unused light, reflective materials improve overall lighting efficiency, helping plants receive more usable energy without increasing power consumption.
How Reflective Materials Developed in Indoor Growing
Historically, early indoor growers used white paint or improvised reflective surfaces to improve light coverage. As indoor cannabis cultivation expanded in the late 20th century, purpose-built reflective materials became common. Advances in horticultural design led to materials engineered specifically to reflect PAR (photosynthetically active radiation) evenly across the grow area.
How Reflective Surfaces Improve Light Distribution
Reflective material works by redirecting light rays that miss the canopy back toward the plants. This increases light uniformity, reduces shadows, and helps lower branches receive more illumination. Unlike mirrors, which reflect light directionally, quality grow-room reflective materials scatter light diffusely (spread evenly), reducing hot spots and light stress.
Common Types of Reflective Materials Used in Grow Rooms
Common types of reflective material include flat white surfaces, Mylar (a reflective plastic film), and specialized horticultural films. Flat white paint reflects a high percentage of usable light evenly and is inexpensive. Mylar reflects a very high amount of light but must be installed smoothly to avoid wrinkles that can create hot spots. Advanced reflective films are designed to maximize PAR reflection while minimizing glare and heat concentration.
Why Reflective Materials Matter for Canopy and Yield
In cannabis cultivation, reflective materials are especially important in enclosed spaces such as tents and rooms. They improve PPFD distribution, support an even canopy, and help maximize yield per square foot. Proper reflectivity can reduce the need for higher light intensity, improving energy efficiency.
Common Reflective Material Issues and Best Practices
Common challenges include damaged or dirty surfaces, improper installation, and using overly shiny materials that create uneven reflection. Best practices include keeping surfaces clean, smooth, and well-maintained.
Related terms:
Lighting, PPFD, Hot Spot, Even Canopy, Light Distribution, and Indoor Cultivation.
Stay informed as the site grows.
If you’d like to be notified when new glossary terms or educational resources are added, you can join the mailing list below.
We send emails occasionally and only when there’s something genuinely useful to share.