Grow Lights for Indoor Plants: Which LED, How Close, How Long (Video)

Transcript

Can a cheap 6500K LED replace sunlight for your kitchen herbs?

Can a cheap 6500K LED replace sunlight for your kitchen herbs?

Grow Lights Made Simple

Stick around and I'll show you the one trick that lets cheap white LEDs grow herbs like they’re in sunlight.

Do they work?

Yes, plants don’t care if the light comes from the sun or an LED; they just need enough photons hitting the leaf for enough time. In a city apartment, natural light can drop to a fraction of what even shade-loving plants crave. A lamp placed close above the leaves makes up that gap, but remember it won’t fix over-watering or cold drafts.

Which LED to pick?

The colour temperature on the box tells you how blue or warm the light looks. A cooler daylight around 6500 K is perfect for leafy growth, so herbs, lettuce and seedlings thrive under a plain white tube. If you’re chasing flowers or fruit, a full-spectrum grow light gives better results, while cheap purple panels can be harsh and make inspection tricky.

Shelf trick

Fix two 20-watt daylight LED tubes under a shelf, side by side, and hang them on chains so you can raise them as the plants grow. A tray of coriander, mint and lettuce sitting six to eight inches below the tubes, run fourteen hours on a timer, will keep growth even in a windowless kitchen corner. Paint the wall behind white or line it with foil to bounce light back.

Monthly energy use

A single 20-watt tube running fourteen hours a day for a month consumes about 8.4 kilowatt-hours of electricity, roughly a few dollars on most household bills, and far less than a big panel left on all year. That modest cost makes the DIY shelf setup affordable for any apartment.

Hours to run

Most guides suggest twelve to sixteen hours, but twelve to fourteen hours works well for herbs and seedlings. Leafy greens like lettuce, spinach and coriander thrive in that window, while foliage houseplants such as pothos or snake plant only need eight to twelve hours as a top-up to any natural light. Consistency beats occasional over-lighting, and a simple timer keeps the schedule painless.

Distance matters

Light intensity drops quickly with distance, so a weak tube at two feet does little, while the same tube at six inches can make a difference. Start with six to eight inches for seedlings and herbs, twelve to twenty-four inches for larger foliage, and eighteen to thirty-six inches for low-light tolerant plants. Watch the leaves, pale, stretched growth means you need to move the light closer or add time.

The one key tip

Here’s the takeaway: a plain white 6500 K LED tube placed six to twelve inches above your herbs, run on a timer for twelve to fourteen hours each day, gives you a sunny-like garden without the cost of fancy panels. Adjust the height as they grow, and you’ll see steady, healthy leaves.

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Read the full guide

The full guide is on thecareonline.com. General information only, so check with your doctor for your own case.