Tools · buyer's guide
Best Indoor Grow Lights for Winter Greens and Seedlings (2026)
A sunny windowsill is not enough light, and that is why so many seed-starting tries end in tall, floppy seedlings that fall over. Seedlings need a light held 2 to 4 inches above them, running 14 to 16 hours a day, or they stretch for the light and go leggy. The same lights keep a tray of lettuce and greens going all winter. Here is the gear to start strong.
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How we picked
The two things that make or break seedlings are how close the light sits and how long it runs. We picked for full-spectrum output, a mount you can raise as the plants grow, and a size that fits the space you actually have, from one tray to a whole shelf.
Get the basics right and cheap gear works fine. Keep the light 2 to 4 inches above the leaves, run it 14 to 16 hours a day, and raise it as they grow. Skip any of those and even a pricey light gives you leggy plants.
Our picks
- Best for a shelf of seedlings
Full-Spectrum LED Panel
Best for a shelf
- A flat LED panel lights a whole 10 by 20 tray evenly, so every seedling gets the same 14 to 16 hours instead of the ones near a window stretching toward it.
- LEDs run cool and sip power, so you can leave them on all day without cooking the plants or the bill.
- Downside: a good panel costs more up front than a clip light, so it pays off best if you start a full shelf of trays.
- Best budget option
Clip-On Grow Light
Best budget option
- A gooseneck clip light costs the least and bends right down to 2 to 4 inches above a small tray or a few pots.
- The clamp mounts to a shelf or table edge with no stand to buy, so it is the fastest way to get started.
- Downside: one clip light only covers a pot or two, so it does not scale to a full tray of seedlings.
- Best paired for germination
Seedling Heat Mat
Best paired for germination
- A heat mat warms the soil 10 to 20 degrees above room temp, which is what wakes up warm-season seeds like tomatoes and peppers so they sprout in days, not weeks.
- It pairs with any light above: warmth to sprout, then light to grow strong.
- Downside: once the seeds are up, take them off the mat, since too much bottom heat with weak light makes seedlings stretch and go leggy.
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Questions, answered straight
Keep it 2 to 4 inches above the leaves. Any higher and the seedlings stretch and go leggy reaching for it. Raise the light as the plants grow to hold that gap.
14 to 16 hours a day. Seedlings need far more light than a house window gives, so put the light on a timer and leave it running most of the day. They still need a dark rest, so do not run it 24 hours.
Yes. Leafy greens do not need as much light as fruiting crops, so a full-spectrum light 14 to 16 hours a day keeps a tray of lettuce, spinach, and herbs going through winter.
The mat speeds up sprouting by warming the soil, and the light grows strong plants after they are up. Warm-season seeds like tomatoes and peppers sprout much faster on a mat, but take them off it once they emerge.