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How to Choose the Best Indoor Lighting for Plants
Whether it’s for your full-grown houseplants or starter seedlings, check out these grow light options for your indoor plants.
African Violet ‘Persian Prince’ (Heather Demers)
Fluorescent lights are ideal for plants with low to medium light requirements, like African violets.
Photo by: Winston J. Goretsky/African Violet Society of America
Winston J. Goretsky/African Violet Society of America
It can be difficult to provide enough light to your houseplants due to seasonal changes or lack of window space. See these pointers on how to choose the best indoor lighting for your plants.
LED, which stands for light-emitting-diode, is the most common type of grow light these days. The bulbs are highly efficient, producing very little heat in comparison to their brightness. A wide variety of options can be found, including screw-in replacement bulbs, stand-alone clip-on and desktop fixtures, and even high-intensity greenhouse lights. LED grow lights typically provide full-spectrum lighting, but many can also be tailored to the specific bandwidth your plants need. Several LED products can be programmed to provide different levels of intensity at different times of day, and some can even offer smart technology that lets you synchronize them with your smart phone.
Shop for Indoor Grow Lights
Gooseneck Grow Light
Clip-On Grow Light
Screw-In Grow Bulb
4000W Greenhouse Light
Fluorescent Grow Light
630W Metal Halide Kit
Incandescent lights are good for lighting up a room or growing low-light houseplants, such as vines, ferns or dracaenas. They have limited utility for growing plants with higher light requirements. These lights put out only about 10 percent of their energy as light while 90 percent is heat. So, unless you want to cook your plants, they aren’t ideal for light-loving plants like many tropicals, cacti or succulents.
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Fluorescent lights are ideal for plants with low to medium light requirements, like African violets. They are also good for starting vegetables indoors. These lights typically come in long, tubelike bulbs in a range of sizes including T5, T8 and T12.
The narrower the bulb, the more efficient and brighter it is, due to the smaller surface area. In addition to this, fluorescent bulbs use 75 percent less energy than incandescent lights. So, for example, a 25-watt fluorescent emits about as much light as a 100-watt incandescent light bulb. T5 systems put out about double the amount of light per tube as standard fluorescent lights. They are 6500 Kelvin and also full spectrum, which is very intense light.
Kelvin is a basic unit of color temperature used to measure the whiteness of a light’s output; it’s the degree of visual warmth or coolness of a light source. So the higher the degree of Kelvin, the bluer, or “cool,” the lamp appears. The lower the degree of Kelvin, the redder, or “warm,” it appears.
When growing most houseplants, use light bulbs between 4000 and 6000 Kelvin, as the bulb’s color temperature will borrow from a full spectrum of colors—cools and warms. With these lights, you can actually mimic the growth you would get in a greenhouse or outdoors. Culinary herbs, greens and starter plants can be grown year-round with them. Houseplants that need lots of light, like cattleya orchids, succulents and carnivorous plants, also perform much better under these full-spectrum lights. With starter plants and seedlings, place the T8 or T5 bulbs two to four inches from the plants to mimic the sun. For established plants, including herbs or houseplants, place them a foot or two from the light source.
Compact Fluorescent Lights
Compact fluorescents are great for lighting indoor houseplants without having to use a full T5 system and for a fraction of the cost of incandescent lights. Wattage varies, so be sure to ask a specialist what will work best for you and your lighting needs. Carnivorous plants and phalaenopsis orchids do well under compact fluorescents.
Halides are generally used in larger spaces or on larger plants, as they cover more distance in terms of lighting. In most cases, you’re not going to need a 1000-watt light. You can get by with a smaller halide or the T5 fluorescent system.
Remember, plants need darkness too. Although they can grow under continuous light, all plants prefer a dark period. Provide them with 12 to 18 hours of light per a day.
HGTV helps you find the right indoor lighting to help your houseplants grow and flourish. New options include full-spectrum LED bulbs and fixtures that can be programmed to give the right brightness at the right time of day to help your plants thrive.