Choosing the Best Artificial Lights for Indoor Herb Gardening: Fluorescent vs LED

Choosing the Best Artificial Lights for Indoor Herb Gardening: Fluorescent vs LED

Herbs need 14–18 hours of high-quality light daily. Here's how to pick the right system.

Fluorescent (T5 High Output)

• Pros: Low heat, even coverage, affordable fixtures, proven for seedlings/herbs.
• Cons: Bulbs degrade (replace yearly), less energy-efficient than LED.
• Best for: Shelves, small spaces, budget setups.

LED (Full-Spectrum)

• Pros: 50,000+ hr lifespan, tunable spectrum, low heat, energy-efficient.
• Cons: Higher upfront cost, quality varies wildly.
• Best for: Long-term, larger areas, precision growing.

Key Specs to Look For

• PPFD (Photosynthetic Photon Flux Density): 200–400 µmol/m²/s for herbs.
• Spectrum: 4000–6500K (cool white) + 660 nm red + 730 nm far-red.
• Coverage: Match fixture footprint to plant canopy.

Setup Guidelines

1. Hang lights 6–12 inches above canopy; raise as plants grow.
2. Use timer: 14–16 hrs herbs, 12–14 hrs foliage.
3. Rotate plants weekly for even growth.
4. Add small fan for airflow (prevents legginess, strengthens stems).

Herb-Specific Needs

• Basil: Highest light (400+ PPFD), 16 hrs, 75°F+.
• Mint, parsley, chives: Tolerate lower light (150–200 PPFD).
• Rosemary, thyme: High light, but cooler temps (65–70°F).

Invest in a PAR meter or use manufacturer's hanging height charts. Good light = compact, flavorful herbs.