Best Grow Lights for Houseplants

The best grow lights for houseplants give the right amount of full-spectrum light at the right distance for the right number of hours, so plants stay compact and healthy even in a dim room or through a dark winter.

Many houseplants sit in rooms that don’t give enough light, and the result is pale, leggy growth. This guide explains the types of grow lights for houseplants, how to read the specifications, how to place and time them, and which plants need which light level. It’s general information, and your local extension service or the Royal Horticultural Society (RHS) can add tips for your plants. Links on this site may earn a commission, and that never changes what we recommend.

It belongs to the Indoor Plants guides and works with Best Low Light Houseplants, How to Water Houseplants and Grow Lights for Seedlings.

Best grow lights for houseplants at a glance

These are typical values. Room, plant and distance change what you need, so start with the maker’s guidance and adjust to how your plants respond.

How to choose grow lights for houseplants

1. Judge your light first. Stand where the plant sits at midday, and note whether a hand’s shadow is sharp (bright), soft (medium) or barely visible (low).
2. Pick the type. Choose a full-spectrum LED for most plants, and a T5 tube for a wide shelf.
3. Check the coverage. A panel of 30 W may cover roughly 40 to 60 cm, so match it to your shelf or plant group.
4. Read the intensity. Look for PPFD figures, and aim for about 50 to 150 for low-light foliage and 200 to 400 for herbs and succulents.
5. Choose the colour. A light of 3000 to 5000 K looks natural in a room, and cooler 6500 K suits seedlings and herbs.
6. Add a timer. Set 10 to 14 hours on, and 8 or more hours off.

How grow lights, plants and room conditions interact

Pothos, snake plant and ZZ plant tolerate low light but grow slowly under a lamp, while monstera, rubber plant and fiddle leaf fig need brighter light and respond well to a panel. Succulents, cacti, basil and chives need strong light for compact growth, and orchids flower more reliably under 12 hours of steady light. Light also changes how much water a plant uses, so brighter plants dry out faster and need checking more often.

A south facing window gives about 6 hours of bright light in summer, but a north window gives much less, and winter days are shorter everywhere. Heat from a poorly made light dries leaves and the surrounding air, whereas cool LEDs let you place them close. Spider mite attacks dry, stressed plants, and humidity of 50% reduces the problem. Calathea and ferns also need humid air as well as light, and a pebble tray adds a little moisture.

A worked example: a shelf of foliage plants

Take a shelf 80 cm wide with a pothos, a snake plant and a small monstera. Fit one LED bar of about 30 W, 60 to 80 cm long, 30 cm above the leaves. Plug it into a timer set to 12 hours, and a protected socket. After two weeks check the plants: new leaves that are small and pale mean more light is needed, while bleached or curled leaves mean the light is too close. Raise the bar 10 cm if that happens. Water when the top 3 cm of compost feels dry, because brighter plants use more water. A light costing a few pence per day to run keeps the shelf healthy all winter.

Placement and safety

• Keep it level above the leaves: lights angled at the side give uneven light and lean the plants.
• Use a timer: plants need a steady daily cycle, and a timer also saves energy.
• Stay clear of water: keep sockets and cables away from watering cans, vases and drips.
• Check for heat: a light that feels hot to your hand is too close to the leaves.
• Protect pets: keep cables out of reach, and check with your vet or the ASPCA if any plants are toxic to cats or dogs.

How light affects houseplants through the year

Daylight in a room can drop by half between summer and midwinter, so a plant that thrives in July may stretch in January. Pothos and philodendron respond to extra light with larger leaves, and snake plant tolerates dim corners but grows faster under a lamp. Orchid needs about 12 hours of steady light to flower, whereas cactus and succulent need strong light of 200 to 400 PPFD to stay compact.

Overwatering kills succulent and cactus in low light, so water less in winter and make sure the pot drains. Fungus gnat is attracted to wet compost, and perlite drains water and prevents root rot. Dust on leaves blocks light, so wipe them every 2 weeks with a damp cloth. Repot every 18 months into a pot 2 cm wider, and the plant will use the extra light well. Your vet or the ASPCA can tell you which plants are safe for pets.

Which grow light for which room

Reading what plants tell you about light

Stretched stems with wide gaps between leaves mean the plant needs more light, and pale new growth suggests the same. Bleached patches or crispy brown edges nearest the bulb mean the light sits too close, so raise it 10 cm and watch for a week. Leaves that face the lamp and turn away from the window show uneven light, and a quarter turn of the pot every week keeps growth even.

Heat from a lamp dries the compost faster, so check moisture more often than before. A fan or an open window keeps air moving, and prevents the damp conditions that favour fungus gnats. Choose LED over older bulbs, because LED runs cool and uses less power, and many last 25,000 hours or more.

Suggested picks to check

We have not tested these products ourselves. They are suggestions that match the criteria above, so check the current size, specification and price on the seller’s page before you buy.

Related guides

Use this guide with Best Low Light Houseplants Grow Lights for Seedlings How to Water Houseplants Humidity for Houseplants Houseplant Problems & Fixes Succulents & Cacti Indoors.

Common mistakes

• Buying by lumens. It measures light for people, not plants.
• Leaving the light on all day. Plants need a dark period to rest.
• Placing it too far away. The light weakens quickly with distance.
• Using a bulb that heats up. Heat scorches leaves and dries the air.
• Forgetting to adjust watering. Brighter plants dry out faster.

Next steps

Judge your room’s light, then choose a full-spectrum LED to match the plants and the space. For plants that cope with dim rooms read Best Low Light Houseplants, for watering read How to Water Houseplants and for sowing indoors read Grow Lights for Seedlings. The Indoor Plants guides link every step.