Best Grow Lights

How to choose a grow light for indoor gardening

The right grow light depends on three things: what you are growing, how much space you have, and your budget. LED panels are the best all-around choice for most US home gardeners in 2026. T5 fluorescent lights remain a strong option for seed starting on a tight budget.

This guide covers the four main grow light types, the numbers that actually matter when comparing fixtures, and specific use cases — seedlings, herbs, houseplants, and fruiting crops.

The four types of grow lights

Full-spectrum LED is the technology that has largely replaced everything else in the consumer market. The key advantages: LEDs convert more electricity to usable light (less wasted as heat), they last 50,000+ hours (10+ years at typical use), and full-spectrum models support every plant growth stage from seed to fruit.

T5 fluorescent fixtures are 4-foot or 2-foot tubes mounted in reflective housings. They produce even coverage over seed trays at a lower upfront cost than LED. Their disadvantage: they use more electricity for the same light output and tubes degrade and need replacement every 1–2 years.

HPS/HID (High Pressure Sodium / High Intensity Discharge) lights are used commercially for high-yield fruiting crops like tomatoes and cannabis. They produce intense light but also intense heat. In a US home, the heat management required makes them impractical unless you have a dedicated growing room with ventilation.

CFL bulbs in standard sockets provide minimal supplemental light for a single plant near a window. They are not suitable as primary lighting for any serious indoor growing.

The numbers that matter: PPFD and DLI

PPFD (Photosynthetic Photon Flux Density) measures how much usable light reaches your plants per square foot per second. It is measured in micromoles (μmol/m²/s). Wattage alone does not tell you how much light your plants receive.

PPFD requirements by plant type:

Most LED panel manufacturers publish PPFD maps in their product listings — these show light intensity across the coverage area at a specific mounting height. A fixture showing 400 PPFD at 24 inches covers more area with that intensity than one showing 400 PPFD only at 12 inches.

DLI (Daily Light Integral) is total light delivered over a full day. It is PPFD × hours of light. Most vegetables need a DLI of 20–40. If you extend light hours to 16–18 per day, a lower-PPFD fixture can still reach an adequate DLI for seedlings and herbs.

Best grow lights for seed starting

For seed starting — germinating tomatoes, peppers, basil, and annual flowers indoors — T5 fluorescent or entry-level full-spectrum LED are the two best options. Seedlings do not need high light intensity; they need consistent, even coverage 4–8 inches above the trays.

Seed starting setup that works:

• T5 shop light (4-foot, 2-bulb): Covers a standard 1020 seed tray directly under the fixture. Position tubes 3–6 inches above the tray surface. Move lights up as seedlings grow. Cost: $30–$50.
• Full-spectrum LED bar or panel (100–200 PPFD target at tray level): Many LED grow bars are designed specifically for seed starting racks. They are thinner than panel-style LEDs and work well for multi-tier shelving systems.

For timing and indoor seed starting details, our how to grow tomatoes from seeds guide covers the full process from sowing through transplant for the most popular US garden crop.

Run grow lights for seedlings 14–16 hours per day. Use a timer — consistent light cycles are more important than slightly more or less intensity.

Best grow lights for herbs and indoor greens

Herbs grown indoors under lights do well with full-spectrum LED panels or T5 fluorescent fixtures. Basil, cilantro, parsley, and chives need 400–600 PPFD and 14–16 hours of light per day to produce harvestable growth.

A 4-inch distance from a T5 fixture or 12–16 inches from a mid-range LED panel delivers the right intensity for most herbs. Signs of insufficient light: tall, spindly plants leaning toward any available natural light source. Signs of excessive light: pale, bleached-looking leaves or tips that look scorched.

LED bar systems mounted inside a kitchen cabinet or on shelving above a countertop herb garden are a practical setup. A two-bar LED system covering a 2x2-foot area costs $60–$120 and supports four to six herb pots.

For indoor herb growing technique including soil, watering, and harvest rotation, our how to grow herbs indoors guide covers 12 common US herbs with specific light and care requirements.

Best grow lights for houseplants

Houseplants with low to moderate light needs — pothos, snake plants, philodendrons — do not need intense grow light. A basic LED desk lamp or low-output LED panel placed 12–18 inches from the plant works for supplemental lighting in dim rooms.

For high-light houseplants like succulents, citrus trees, or bird of paradise, a full-spectrum LED panel producing 300–500 PPFD at the canopy is needed to maintain healthy growth indoors.

The biggest mistake with houseplant grow lighting is placing a high-output fixture too close to the plant and causing light burn — pale, bleached patches on leaves closest to the light source. Start at the manufacturer’s recommended distance and move closer only if plants show signs of insufficient light.

For low-light houseplants that survive without supplemental lighting, our low light houseplants guide lists the most forgiving options for US homes with limited natural light.

Best grow lights for indoor fruiting crops

Growing fruiting vegetables — tomatoes, peppers, cucumbers — under artificial light is possible but demanding. These crops need 600–900+ PPFD for 16–18 hours per day, which requires a high-output LED panel and significantly higher electricity costs.

A 400-watt commercial-grade LED panel can support 2–4 indeterminate tomato plants in a 3x3-foot footprint. At $0.15/kWh running 16 hours daily, that’s roughly $28/month in electricity — worth calculating before committing.

For most US gardeners, grow lights for fruiting crops make more sense for extending the season than for full indoor growing. Starting tomatoes and peppers 6–8 weeks before last frost under a 200-watt LED panel, then moving them outdoors, is a better use of the equipment than trying to fruit plants entirely indoors.

Full-spectrum vs. red-blue LED panels

Full-spectrum white LED panels outperform red-blue “blurple” panels for most plants in home gardens. The red-blue spectrum was designed around photosynthesis efficiency in controlled research settings, not practical home growing results.

The visible light difference: red-blue panels produce a purple-pink glow that makes it hard to spot pests, yellowing leaves, or other plant problems. Full-spectrum panels produce white or warm-white light that looks natural and lets you see plant health clearly.

Avoid red-blue panels sold at very low price points. They tend to have inaccurate PPFD ratings and fail within 1–2 years.

LED grow light costs and energy use

A 200-watt LED grow light running 16 hours per day:

• Daily electricity use: 3.2 kWh
• Monthly cost at $0.13/kWh: approximately $12.50
• Monthly cost at $0.17/kWh: approximately $16.30

LED fixtures use 40–60% less electricity than equivalent-output HID or T5 systems. Over a 5-year period, the energy savings from LED typically exceed the higher upfront cost compared to fluorescent.

Most LED grow lights carry a 3–5 year manufacturer warranty. Reputable brands with US customer service and published PPFD data include AC Infinity, Spider Farmer, Mars Hydro, and Gavita. Big-box store LED grow lights are often lower quality with inflated wattage claims.

Setting up a grow light: practical steps

1. Measure your space: Know the length and width of the area you want to cover. Most LED panels publish a coverage area at a specific PPFD — match this to your needs.
2. Choose mounting height: LED panels need to hang at the right distance from the canopy. Most consumer panels work at 12–24 inches. Buy adjustable hanging hardware (included with most panels).
3. Use a timer: Set lights to run 14–16 hours per day. Consistent cycles matter more than manually adjusting light hours.
4. Monitor plant response: Too much light shows as pale bleached patches. Too little shows as stretched, leggy growth leaning toward any natural light source.
5. Raise lights as plants grow: Keep the recommended distance between the fixture and the top of the plant canopy as growth proceeds.

For specific houseplants that respond well to grow light supplementation, our best indoor plants for air quality guide covers varieties that perform in both natural and artificial light conditions.

What to avoid when buying grow lights

Avoid grow lights with no published PPFD data. Reputable manufacturers provide PPFD maps showing actual light intensity at multiple distances. A fixture listed only by wattage with no PAR or PPFD data is a red flag.

Avoid “equivalent wattage” claims. A fixture marketed as “1000W equivalent” may draw only 100 actual watts. The actual draw — not the equivalent — is what matters for coverage area and energy calculations.

Avoid cheap T5 replacements with LED tubes. These often produce less light than a standard T5 fluorescent tube while advertising LED efficiency. Stick with a dedicated LED panel or a quality T5 fixture.

For indoor seed starting that maximizes grow light investment, our low light houseplants guide covers which plants survive on minimal supplemental light — useful for deciding which plants need the grow light and which can manage in a dim corner without it.