Choosing the Right Artificial Lighting for Indoor Herb Gardens: Fluorescent Grow Lights vs. Other Options

Why Fluorescent Grow Lights Are Ideal

For herbs and other high-light plants indoors, fluorescent grow lights offer the best balance of spectrum, efficiency, and cost. Unlike full-spectrum bulbs (which waste energy on wavelengths plants don’t use), fluorescent grow lights concentrate output in the blue and red regions that drive photosynthesis and flowering.

Recommended Setup

• Low to medium light plants: 15-watt fluorescent grow tubes with fixtures (~$12 at home improvement stores).
• Medium to high light plants: 75-watt fluorescent grow tubes with fixtures (~$10 at Walmart). Use 2–3 tubes for high-light herbs.

Placement and Duration

• Position plants 8–12 inches below the tubes.
• Run lights 16–18 hours daily.
• Use a timer ($7–$20) for consistency.

Why Not Reptile Lights or Full-Spectrum Bulbs?

Reptile CFLs emit a broad spectrum including UV, which isn’t necessary for plants and may produce excess heat. Full-spectrum “daylight” bulbs waste much of their output on green/yellow light that plants reflect. Fluorescent grow lights are engineered for plant efficiency—almost all their light is usable.

Heat Management

Fluorescent tubes run cool, but if using higher-wattage fixtures, ensure leaves don’t touch the tubes. Monitor leaf temperature; if they feel hot, raise the lights.

Helpful Resources

• University of Missouri: Indoor Lighting for Plants
• Wayne's Fluorescent Light Guide