Modern gardeners know that using grow lights can do wonders for plant growth. But which grow light should you choose: pink or white? While some indoor plants may thrive with minimal lighting during certain seasons, others require a boost to continue growing. Meanwhile, seedlings, garden transplants, and flowering plants may need more intense lighting than your home can provide.
There are two main types of light-emitting diodes (LEDs) used in horticulture. The first type emits a whitish or pure white light. These are also known as “full-spectrum” LEDs because they contain a mix of green, blue, and red wavelengths.
The second type emits specific-colored light, such as pink, blue, or red. These are known as “narrow-spectrum” LEDs because they produce light in a limited wavelength range.
But which light color is best for plant growth? This article will explore the specifics of each type to help you decide whether to choose a pink or white grow light.
How Light Color Affects Plant Growth
The color of a grow light can influence the amount of chlorophyll—the green pigment in plant leaves and stems. Chlorophyll absorbs visible light energy to convert carbon dioxide into food for plants. Adjusting or enhancing the light can help plants grow faster and healthier.
Blue light is the most recommended for seed germination as it promotes leaf development. Later, violet or pink light can be introduced to enhance the plant’s color or sweetness. Pink light is a combination of blue and red and is particularly well absorbed by plants since it contrasts with the green spectrum.
The Benefits of Pink and White Grow Lights
Pink Grow Lights
While plants under pink grow lights may appear as if they’re at a neon party, this lighting is excellent for plant growth. They work similarly to lamps that help people get more vitamin D. Most people prefer to use pink grow lights in greenhouses or for plants that don’t receive enough natural sunlight.
Pink LEDs are not as powerful as violet ones but consume less energy. They also provide a softer, more delicate light. There are different variations of pink grow lights, some more intense than others.
Red light is essential for plants as it regulates stem elongation, photosynthesis, and overall plant growth. Meanwhile, blue light stimulates leaf expansion, stomatal opening, photoperiodic flowering, and the plant’s ability to reach toward the light.
Simply put, a combination of these two colors (pink light) is the most effective for guiding a plant from the seedling stage to the vegetative stage and then to flowering.
White Grow Lights
White LED grow lights are often composed entirely of white LEDs, though sometimes they include a significant portion of red LEDs or other colors.
There are different types of white LEDs:
- Cool white LEDs produce a faint blue tint.
- Warm white LEDs emit a softer, slightly pinkish hue.
- Mint-green LEDs give off a greenish light.
The color of white LEDs is determined by the phosphor used to modify red, green, and blue light. While white LEDs are visually appealing and easy on the eyes, they are not as effective as blue-red LEDs for promoting plant growth. However, they are more efficient than pink or violet grow lights for mature and flowering plants.
Key Differences Between Pink and White Light
Recent studies suggest that artificial lighting in greenhouses can support year-round plant growth. Experiments using pink lights, which combine blue and red LEDs, have shown success in large-scale greenhouses, often referred to as “pink houses.”
Certain light colors are more easily absorbed by plants than others. For example, plants reflect most green light and cannot fully absorb it. Pink light, being a combination of red and blue, contrasts well with the natural green of plants, making it an excellent choice for greenhouses and indoor gardening.
Whether you want to experiment with new crops or simply enhance your lighting setup, one fact remains: lighting has a significant impact on plant growth and overall health.