Boost Growth with UV, Deep Red & Far Red LEDs in Your Indoor Garden

Want to boost your indoor garden’s productivity? Whether you grow vegetables, herbs, or ornamental plants, unlocking the full potential of your lighting setup can make all the difference.

In this guide, you’ll discover how supplemental LED bars - UV, deep red, and far red - can dramatically improve plant health, flowering, and yields.

Plus, use our interactive calculator below to instantly estimate the number of light bars (and cost) your grow room needs!

Why Use Supplemental LED Lighting?

Traditional grow lights like HPS do a great job - but they don't cover the full light spectrum that plants can use. That’s where supplemental LEDs come in. By adding targeted wavelengths, you can:

• Increase essential oil production and flavor (UV)
• Maximize photosynthesis and flower density (Deep Red)
• Trigger natural flowering signals (Far Red)

What Each Spectrum Does

UV (Ultraviolet)

• Enhances aroma and flavor by stimulating resin and terpene production
• Improves pest resistance
• Use moderately, especially during the final 2 - 3 weeks of flowering

Deep Red (650–680nm)

• Drives photosynthesis and boosts energy conversion
• Promotes fuller, faster flowering
• Best used throughout the flowering stage

Far Red (700–750nm)

• Alters plant structure and stimulates flowering
• Helps mimic sunset to trigger blooming when used for 10 - 30 minutes at day’s end

How Much Supplemental Light Do You Need?

Here’s a quick reference using 30W LED bars for a standard grow room:

Or, use this formula for any room size:

• UV bars = Room Area (m²) × 11 ÷ 30
• Deep Red bars = Room Area (m²) × 8 ÷ 30
• Far Red bars = Room Area (m²) × 5 ÷ 30

Round up for optimal coverage.

How to Use Each Spectrum

• UV: Start with 15 minutes per day during late flowering and increase gradually.
• Deep Red: Run during your main light cycle throughout bloom and fruiting stages.
• Far Red: Add for 10–30 minutes at “lights off” to trigger flowering cues.

Key Benefits of Supplemental LED Bars

• Custom Spectrum Control: Tailor lighting by plant stage
• Energy Efficiency: Lower power draw with more usable output
• Long-Lasting: LED bars last thousands of hours with minimal upkeep
• Grow Anything: Ideal for vegetables, herbs, flowers, and more

Final Tips

• Space bars evenly for full canopy coverage
• Adjust height as plants grow
• Monitor plant response and tweak spectrum/timing

By integrating the right supplemental lighting - and using our calculator to size it right - you’re setting up your indoor garden for its healthiest, most productive season yet.

Are you ready to supplement your grow room light? Check this tool