Yes. Plant lights can significantly influence plant form (morphogenesis) and nutrient quality (primary/secondary metabolism) by adjusting the spectrum, intensity, and photoperiod. The key is "using the right light," not just "having light."

I. Effects on Plant Form (Morogenesis)

Blue Light (≈450 nm)

Functions: Inhibits excessive growth, promotes compact plant form, thickens leaves, and enhances stomatal function.

Applications: Improves dwarfism in seedlings and foliage plants; increases the proportion of blue light or increases the blue component of PPFD.

Red Light (≈660 nm)

Functions: Promotes biomass accumulation and accelerates growth rate; however, red light alone can easily lead to excessive growth.

Applications: Used in combination with blue light to promote rapid leaf growth during the vegetative stage and improve flower bud differentiation and yield during the flowering stage.

Far-Red (≈730 nm)

Functions: Lengthens internodes, promotes elongation, and changes growth direction; sometimes beneficial for flowering induction.

Applications: Small amounts of far-red can be used during the flowering stage or for crops requiring elongation; generally used cautiously during the seedling stage to prevent weak seedlings. **UVA Band (365–405 nm)

Functions:  Moderate stress promotes epidermal thickening and enhanced secondary metabolism; excessive stress can be damaging.

Applications: Short-term, low-intensity supplementation improves plant compactness and resistance.

II. Effects on Nutritional Quality

Increases Soluble Solids (Sweetness), Vitamins, Flavor, and Aroma

Mechanism: Blue light and UV-A enhance secondary metabolic pathways (such as flavonoids, phenols, and terpenes), increasing flavor and antioxidant capacity.

Applications:"Quality Light" treatment 1–2 weeks before harvest (increased blue light/lower UV-A, moderately reduced red light intensity) can improve flavor and color.

Enhances Chlorophyll and Nutrient Density

Mechanism:Appropriate blue light and sufficient PPFD increase chlorophyll content, carotenoids, and vitamin C.

Applications: Leafy vegetables under moderate PPFD (200–400 μmol/m²/s) with increased blue light concentration show improved common nutritional indicators.

Controlling Nitrate Accumulation

Mechanism: Higher light intensity and appropriate photoperiod improve carbon-nitrogen balance, reducing nitrate accumulation in leafy vegetables.

Application: Maintain stable light levels before harvest, combined with ventilation and appropriate potassium and calcium management.

III. Practical Strategies (Light Formulas for Different Objectives)

Seedling Raising (Short and Sturdy, Uniformity)

Spectrum: Full-spectrum white light as a base, with relatively higher blue light; moderate red light.

PPFD: 150–300 μmol/m²/s; Photoperiod 14–18 h.

Leafy Vegetable Quality (Flavor/Color/Nutrition)

Spectrum: Increase the proportion of blue light, add low-intensity UV-A (use with caution); maintain moderate red light.

PPFD: 200–400 μmol/m²/s; Photoperiod 14–16 h.

Pre-harvest Quality Treatment: Increase blue light or short-duration UV-A for 7–14 days to enhance flavonoids and aroma.

Balance between Fruit and Vegetable Yield and Plant Type (Tomato, Pepper)

Spectrum: Red light dominates to enhance biomass and flowering/fruiting; moderate blue light prevents excessive vegetative growth; far-red light is used sparingly for flower induction or to improve canopy light distribution.

PPFD: 400–600 μmol/m²/s during the vegetative growth stage; 600–900 μmol/m²/s during flowering and fruiting; photoperiod is typically 16–18 h (adjusted according to variety and cultivation system).

IV. Precautions and Supporting Environment

Intensity and Distance: Excessive light intensity or too close a lamp distance can cause scorching; insufficient light leads to excessive vegetative growth and nutrient deficiency. Adjust light intensity/lamp distance promptly based on leaf temperature and morphology.

Ventilation and Temperature/Humidity: Quality improvement depends on good ventilation, temperature control, and appropriate CO₂; spectrum alone cannot compensate for environmental deficiencies.

Nutrition and Water: Increased light intensity requires simultaneous optimization of water and fertilizer management (especially potassium, calcium, and micronutrients), otherwise quality effects will be limited.

Light Uniformity and Consistency: Uniform illumination and consistent management are key to improving uniformity and marketability.

V. Sample Quick Script (for Customer Communication)

"Yes, plant lights can significantly improve plant shape and nutrient quality. Increasing the proportion of blue light during the seedling stage can make seedlings shorter and stronger; increasing blue light or a small amount of UV-A before harvest can enhance flavor and color."

"If your goal is to improve the nutrition and taste of leafy vegetables, we recommend increasing blue light to 20–30% on a full-spectrum basis, maintaining PPFD at 200–400 μmol/m²/s, and implementing quality light management 1–2 weeks before harvest."

"For fruit and vegetable crops, to balance yield and plant shape, red light should be dominant, supplemented with blue light to prevent excessive vegetative growth; far-red light should be used cautiously in small amounts for flowering induction."

If you tell me your specific crop, area, existing lighting parameters (power, PPF, spectrum), cultivation environment, and goals (yield/flavor/ornamental), I can provide you with a precise spectral ratio, PPFD, lamp spacing, and photoperiod plan, along with electricity costs and expected improvement targets.