Indoor Plants Growing Guide in Winter: For Advanced Growers

In our previous post, we've delved into the distinctive challenges that winter poses for indoor plant cultivation and the solutions offered by Mars Hydro. However, for advanced growers seeking top-tier crop quality and the cultivation of diverse plants, it's crucial to pay special attention to the array of issues arising from limited natural light.

Relying solely on full-spectrum lighting falls short of meeting the expectations of advanced growers. To cater to the diverse requirements of different growth stages, optimize spectra for flowering and fruiting, and achieve maximum plant yield, specific plant growth lights supplementing additional red light, ultraviolet and infrared light become essential. Mars Hydro's UR45, VG40, VG80, VG40R, and VG80R provide choices tailored for advanced growers.

To comprehensively understand why supplemental light plays a pivotal role in your indoor garden, let's explore:

  1. Advantages of Using Supplemental Light in Winter

  2. The Significance of UR45

  3. The Necessity of VG80/VG40

  4. The Crucial Role of VG80R/VG40R

Let's now explore each aspect in detail to underscore the significance of supplemental light for advanced indoor gardening!

Benefits of Using Supplemental LED Light in Winter

Enhanced Photosynthesis

Supplemental red light, infrared light, and ultraviolet light during winter can enhance photosynthesis, as each spectrum contributes to different aspects of the process. Red light stimulates chlorophyll production, infrared light supports efficient light absorption, and ultraviolet light aids in the production of secondary metabolites.

Optimal Flowering and Fruiting

Red light plays a crucial role in promoting flowering, while infrared light ensures better fruit development. Integrating these spectra during winter helps maintain consistent growth cycles, allowing plants to produce flowers and fruits even in low-light conditions.

Stress Reduction

Plants may experience stress during the winter due to reduced sunlight. Ultraviolet light acts as a stress reliever, promoting stronger and more resilient plants by triggering the production of protective compounds. This helps plants cope with the challenging conditions of the season.

Improved Nutrient Absorption

Infrared light aids in the absorption of nutrients by the plants' roots. During winter, when the growth rate may slow down, supplemental infrared light ensures that plants efficiently take up essential nutrients, promoting overall health and vitality.

Enhanced Pest Resistance

Ultraviolet light has been shown to enhance the production of secondary metabolites, such as flavonoids, which contribute to a plant's defense mechanism. This can result in increased resistance to pests and diseases, particularly valuable during the vulnerable winter months.

Extended Photoperiod

Supplementing with red light and infrared light extends the effective photoperiod for plants. This is especially beneficial in winter when natural daylight hours are limited. The extended light exposure provides plants with more energy for growth and development.

Regulation of Plant Growth Hormones

Red light influences the production of plant growth hormones, particularly promoting elongation and flowering. This is valuable in winter when plants may experience stunted growth. The additional red light helps regulate hormone levels for optimal development.

Induction of Photomorphogenesis

Ultraviolet light triggers photomorphogenesis, influencing various aspects of plant growth and development, including germination, leaf expansion, and stem elongation. Incorporating UV light during winter ensures a more comprehensive and natural growth response.

In summary, supplementing with red light, infrared light, and ultraviolet light during winter provides a holistic approach to address the challenges posed by limited natural sunlight. This comprehensive light supplementation supports various physiological processes, resulting in healthier, more resilient plants with improved flowering, fruiting, and overall growth.

The Significance of UR45

the Mars Hydro UR45 LED Grow Light

When considering the essential elements for successful indoor cultivation, the Mars Hydro UR45 LED Grow Light stands out for several compelling reasons. Let's delve into its specifications and features to better understand why UR45 is a crucial component for advanced growers:


- Wattage: 45W (UV: 30W; IR: 15W)

- UV Bands: 365-420nm

- IR Bands: 730-745nm

UV & IR Supplementation for Optimal Growth:

UR45 is designed to complement white full-spectrum grow lights or cater to specific cultivation needs. Its UV and IR supplementation serves multiple purposes, including inducing flowering and sleeping periods, expanding leaf area, enhancing plant nutritional quality, and stimulating biomass production.

Compatibility and Integration:

The UR45, with its two bars, 192 LED diodes, and 45W total output, is a perfect match for the FC6500 and FC8000 LED grow lights. It seamlessly integrates into indoor growing setups, particularly when additional UV and IR radiation is required alongside white full-spectrum LED lights.

UV Grow Light - Maximizing Yield:

The UV component (365-420nm) on the UR45 induces larger leaf areas, promoting effective light interception and significantly increasing overall plant production. Proper UV exposure not only enhances nutritional quality but also stimulates biomass production without causing harm to plant cells.

IR Grow Light - Regulating Plant Growth:

The infrared (730-745nm) spectrum on the UR45, working in conjunction with far-red light, triggers a shade-avoidance response in plants, accelerating stem growth. The introduction of appropriate IR can efficiently guide plants into the flowering stage or induce quicker entry into the sleeping stage.

Separate Control of UV & IR:

A standout feature of the UR45 is its spectral switch, offering the flexibility to independently control UV and IR light. Growers can choose to activate or deactivate each spectrum separately or simultaneously, allowing for the customized configuration of the supplemental spectrum based on specific growth requirements.

Easy Installation and Versatility:

UR45 is user-friendly and comes equipped with brackets designed specifically for Mars Hydro FC and FC-E LED grow lights. Additionally, it includes hooks for easy hanging, simplifying the installation process on light setups and shelves.

In essence, the Mars Hydro UR45 emerges as an essential tool for advanced growers, providing targeted UV and IR supplementation, customizable spectral control, and seamless integration into existing indoor cultivation systems. Its thoughtful design and versatile features make it a valuable asset for achieving optimal plant growth and maximizing yields.

The Necessity of VG80/VG40

The VG Series LED T5 Grow Light

The VG80 LED T5 Grow Light is a critical component for various aspects of indoor plant cultivation, catering to seedlings, cloning, vegetable propagation, and the growth of indoor tropical plants. It stands out with its wide coverage and energy-efficient design, consuming less power while providing a full spectrum of light using OSRAM chips. With an IP65 waterproof rating, the VG80 is particularly suitable for the rapid growth of clones and low DLI green leaf plants. It outperforms traditional fluorescent T5 bulbs in terms of energy consumption, making it a cost-effective option for advanced growers. By delivering high-quality vegetable light, the VG80 actively promotes robust and healthy plant growth.


- Wattage: 80W (40W Each Light Bar)

- Core Coverage: 4ft*2ft

- Recommended tent size: 120x60cm

Noteworthy Features

1. Energy Efficiency:

The VG80 excels in providing high light intensity with lower energy consumption, contributing to reduced electricity costs for growers.

2. Long Lifespan:

With fewer tube replacements and maintenance costs, the VG80 offers a longer operational lifespan, ensuring consistent performance over time.

3. Low Heat Generation:

Unlike traditional fluorescent tubes, the VG80 produces minimal heat, aiding in maintaining optimal indoor temperatures for plant growth.

4. Compact Design:

Its sleek design, thinner than traditional T5 fluorescent tubes, facilitates easy installation on plant cultivation racks or in planting boxes.

Optimized for Cloning and Vegetative Growth

The VG80, designed specifically for low DLI plant light, caters to vegetables, seedlings, and clones. Despite its modest 80-watt power, its low heat output allows it to be hung at a lower height on plant racks without compromising plant health. Covering a large area efficiently, the VG80 achieves the same effect with less energy consumption.

Cost-Effective Option and Maximum Production:

While the VG80 can be used independently for seedling cultivation and cloning, coupling it with lights suitable for the flowering stage and adopting a cyclic planting method can shorten harvest cycles and maximize yields.

Daisy Chain and Functional Diversity:

The VG80's easy installation and daisy-chaining capability of up to 20 LED lights make it convenient for commercial growers. It is compatible with various indoor planting systems, addressing slow growth and narrow leaves in tall plants due to insufficient light.

IP65-Rated Water Resistance:

Equipped with a special transparent waterproof lampshade, the VG80 ensures protection against moisture, allowing it to function effectively in highly humid environments without compromising its lifespan. The waterproof treatment on the interface further reinforces its water-resistant properties.

The VG40, tailored for smaller planting spaces, boasts a wattage of 40W (20W for each light bar) and a core coverage of 2ft*2ft. Ideal for compact indoor gardens or limited cultivation areas, the VG40 not only features an energy-efficient design for cost savings but also comes equipped with the same functions as its counterpart, the VG80. This means growers can enjoy the versatility and tailored lighting solutions of the VG80 in a more condensed form, making it a well-informed choice for those prioritizing efficiency in smaller environments while still benefiting from advanced features.

Choose the VG80 or VG40 for unparalleled quality and reliability in meeting your indoor cultivation needs.

The Crucial Role of VG80R/VG40R

The Crucial Role of VG80R/VG40R

The Mars Hydro VG40R and VG80R LED Grow Lights are equipped with a supplemental 650-665nm extended spectrum, playing a pivotal role in optimizing indoor plant growth. This specific wavelength range is essential for various key aspects of plant development, and here's how it enhances the performance of these grow lights:

1. Photosynthesis Stimulation:

Light in the 650-665nm range is essential for stimulating photosynthesis, the process through which plants convert light energy into chemical energy to fuel their growth. This red light spectrum plays a key role in the photosynthetic process, particularly in the activation of chlorophyll, the green pigment responsible for capturing light energy.

2. Flowering and Fruit Production:

The 650-665nm red light spectrum is crucial during the flowering and fruiting stages of plant development. Plants perceive this red light as a signal to transition from the vegetative growth phase to reproductive growth, leading to the formation of flowers and ultimately fruits. Adequate exposure to this wavelength enhances the development and quality of flowers and fruits.

3. Stem Elongation and Photomorphogenesis:

Red light in the 650-665nm range influences stem elongation and other aspects of photomorphogenesis, which refers to the light-induced changes in plant growth and development. It helps regulate the plant's response to light signals, affecting processes such as seed germination, leaf expansion, and overall plant morphology.

4. Light Sensing and Signal Transduction:

Plants use red light, including the 650-665nm range, as a signal to detect their light environment. The presence of red light is sensed by photoreceptors, such as phytochromes, which then initiate signal transduction pathways within the plant to orchestrate various growth and developmental responses.

5. Supplemental Lighting in Indoor Environments:

In indoor cultivation where natural sunlight may be limited, LED grow lights with an extended spectrum in the 650-665nm range are utilized to provide supplemental lighting. This ensures that plants receive the specific wavelengths necessary for optimal growth and development, especially during critical phases such as flowering.

The VG40R, tailored for smaller planting spaces, incorporates the same functions as its counterpart, the VG80R. With a wattage of 40W (20W for each light bar) and a core coverage of 2ft*2ft, the VG40R is designed for compact indoor gardens. Its energy-efficient design, coupled with the supplemental 650-665nm extended spectrum, makes it an informed choice for growers prioritizing efficiency in smaller environments while benefiting from advanced features.

The VG80R, critical for various aspects of indoor plant cultivation, offers a wattage of 80W (40W for each light bar) and a core coverage of 4ft*2ft. Beyond its energy-efficient design and wide coverage, the VG80R's inclusion of the supplemental 650-665nm extended spectrum ensures comprehensive support for photosynthesis, flowering, and overall plant health, making it an essential tool for advanced growers.


For advanced growers, winter indoor plant cultivation requires a strategic approach, especially in lighting. Mars Hydro's range of LED grow lights offers targeted solutions for every growth stage, from seedlings to flowering plants. By leveraging these tools, you can overcome the challenges of reduced natural light in winter and maintain a thriving indoor garden.