Grow Lights

A grow light is an artificial light source that replaces or supplements natural sunlight for plants growing indoors. Unlike a standard household bulb designed for human vision, a grow light emits the specific wavelengths—especially blue and red—that drive photosynthesis, compact plant development, and fruiting. A plant grow light is calibrated for what your plant sees, not what you do.

Plants use light within the PAR range — wavelengths from 400 to 700 nanometers — to power photosynthesis. PPFD (Photosynthetic Photon Flux Density) measures how many of those PAR photons actually reach the leaf surface each second, expressed in µmol/m²/s. That's the number that tells you whether a grow light is delivering real energy to your plants — not lumens, which measure brightness the way human eyes perceive it. Within the PAR window, blue wavelengths (400–500 nm) drive compact, leafy growth, while red wavelengths (600–700 nm) trigger flowering and fruiting.

Regular household bulbs are optimized for human visibility, not plant biology. They lack the targeted red and blue spectrum that powers photosynthesis and rarely deliver the intensity (PPFD) needed to sustain real indoor growth. A grow light closes that gap; that's what makes artificial light for plants fundamentally different from the lamp on your desk, and it's why the grow light spectrum and intensity is important, not just brightness.

• Full Spectrum LED Grow Lights: Today's best grow light type. Energy-efficient, low heat output, long lifespan, and, in some cases, tunable to a specific light color. All AeroGarden grow lights use LEDs.
• T5 Fluorescent Grow Lights: A budget option for starting seedlings and growing low-light plants; T5 grow lights run cool but lack the needed intensity for fruiting crops.
• HID Grow Lights: Powerful for large commercial operations but generate significant heat and carry higher electricity cost than LED.

• Grow year-round, whatever the weather. Supplement sunlight for plants in winter or windowless rooms, solving the low light indoor plant problem for good.
• Precise photoperiod control. Manage the number of light hours per day and even light spectrum for more consistent results than any window can deliver.
• Supports every growth stage. From grow lights for seedlings to a full vegetable grow light setup, one system adapts as your plants mature.
• Energy-efficient by design. Modern full spectrum LED grow lights keep electricity costs low while maximizing results.

Most edible plants need 14–18 hours of bright light daily; a sunny, summer window delivers 4–6 hours (far less in winter). Grow lights are the definitive winter plant light and the foundation of serious indoor gardening lighting. Herbs stretching toward the window or pale new growth are your plants asking for more.

AeroGarden LED grow lights emit a calibrated blend of wavelengths absorbed by chlorophyll to power photosynthesis from germination to harvest. Blue light builds strong, compact foliage; red light signals plants to flower and fruit. Together they replicate the full arc of natural sunlight which is why a white LED grow light from AeroGarden delivers the best light spectrum for plants without any mixing or guesswork.

A full spectrum grow light covers the complete PAR range—blue, green, red, and often UV and infrared—to closely mimic natural sunlight. Red/blue ("blurple") grow lights target only the photosynthetic peaks, while white LED grow lights blend wavelengths for a natural appearance while hitting the grow light color temperature plants need. For most home growers, a full spectrum LED grow light is the clear choice.

Match grow light output and coverage area to your plant count and type. Low-light plants need lower PPFD (50–150 μmol/m²/s); fruiting vegetables need 300–600+ μmol/m²/s. The best grow light for indoor plants matches the intensity to the species. When using grow lights for seedlings, run the lights 16–18 hours per day with the lights 2-4 inches above the top of the seedlings. The best grow light for herbs runs 14–16 hours of full spectrum LED keeping basil, cilantro, and mint thriving. For a vegetable grow light indoor setup, higher-wattage systems handle tomatoes and peppers that need real intensity and a consistent photoperiod for plants.

Let automation run the schedule. AeroGarden grow lights include a built-in light timer with automatic on/off cycles to keep your plants on the ideal photoperiod without daily intervention.

Match distance to growth stage. Position your grow light a few inches above seedlings, 12–24 inches above established foliage. Leaves bleaching under grow light? Raise the fixture.

Plants leggy under grow light? Lower it or extend the grow light schedule.

Read your plants, not just the timer. Yellowing lower leaves point to grow light too weak or too few hours. Bleached patches signal grow light too close. Compact, vibrant new growth at a steady pace means everything's dialed in.

For herbs and leafy greens: 12–16 inches from the light, 14–16 grow light hours per day. For seedlings: 2-6 inches, 16–18 hours. AeroGarden's programmable grow light schedule manages the light cycle, but you adjust the height of the light.

AeroGarden LED grow lights produce minimal heat output versus fluorescent or HID alternatives. For grow light safety, avoid prolonged direct eye exposure. AeroGarden grow lights are a genuinely energy efficient grow light: low electricity cost, and fully automated with the built-in grow light timer.

• Plants leggy under grow light or pale new leaves: Lower the fixture or extend grow light schedule by 1–2 hours.
• Leaves bleaching under grow light: Raise 3–6 inches and observe for 48 hours.
• Grow light not working: Check connections and reset via the AeroGarden app.

• The Benefits of Grow Lights for Indoor Plants
• Setup Guide: LED Grow Lights
• Plants and Their Light Requirements: A Guide
• How to Grow Vegetables Indoors
• How to Start an Indoor Garden