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  • Writer's pictureStronger Roots

Grow Lights (Overview)


-🪟☀️Place in bright but not direct light. An east window is fine but a west window is too warm and a south facing window too bright. North is too dim. Indoor florescent lights are the best way to ensure adequate light supply to the seedlings/cuttings

Indoor Grow Lights

-Optimal light for seedlings is 16-18 hours a day (can go full 24); Require at least 12 hours of light and 8 hours of darkness

-💡LEDs (Light Emitting Diodes) / Fluorescent Lights -Tube Type (T5/8/12 and shop lights) & CFLs (Compact Fluorescent Light) / HID (High Intensity Gas Discharge) /

-Fluorescent lights within 1-2” of plant tops

-LED Some LED systems are designed to improved efficiency by delivering red and blue spectrums of light exclusively (the wavelengths required for plant growth). This is why some LEDs give off a purple glow, unlike full spectrum lights that emulate daylight

-🌈The Kelvin Scale breaks light into colors. Looking for a K (Kelvin) Rating of 5000-6500K (daylight range) Flash Range

-🔆Lumens = light brightness or intensity; the amount of light emitted per second from any particular light source

•Vegetable seedlings and other “full sun” plants require about 2000 to 3000 lumens (at minimum) per square foot of growing space


2500+ Lumens/6500 Kelvin


2500+ Lumens/5000 Kelvin


1750-2000 Lumens/5000-6500 Kelvin

3000+ Lumens/4000-5000 Kelvin

❗️⚡️A watt is a measure of energy

consumption and really has nothing to do with how much light your plants will actually receive

❗️ Lumen value gets higher, you can use a

lower Kelvin rating

❗️ If your seedling leaves look bleached, move the light back; If the seedlings are stretching or leggy bring it closer till you find the sweet spot

❗️Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis

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