How Close Should Your Grow Light Be? One Chart to Save Your Leaves

You bought a grow light. Great.

You set it up. Even better.

But now comes the question almost everyone asks:

"How far should this light be from my plants?"

Too close, and you'll see bleached, crispy leaves.
Too far, and your plant still starves for light — the light just becomes an expensive ceiling decoration.

Here's exactly how to get it right.

Why Distance Matters

Light intensity drops dramatically with distance. This is called the inverse square law.

In plain English:

Double the distance = one quarter of the light

A light that's perfect at 6 inches is almost useless at 24 inches.

But every plant is different. Some love intense light. Others burn easily.

The Simple Distance Chart (Full Spectrum LED)

Use this as your starting point. Adjust based on what your plant shows you.

⚠️ These distances are for full spectrum LED lights. Cheap blurple lights may need different spacing.

How to Read Your Plant's Response

Your plant will tell you if the distance is wrong — if you know what to look for.

Signs Light Is Too Close (Too Intense)

• Bleached or white patches on leaves

• Brown, crispy leaf edges

• Leaves curling upward (like a taco)

• Rapid soil drying

Fix: Move light 4–6 inches farther away.

Signs Light Is Too Far (Too Weak)

• Stems stretching (etiolation)

• New leaves smaller than old ones

• Slow or no growth

• Lower leaves yellowing and dropping

Fix: Move light 4–6 inches closer.

Signs Light Distance Is Just Right

• Compact, strong stems

• New leaves similar size or larger than older leaves

• Good leaf color (green or normal variegation)

• Predictable weekly growth

One More Tip: Adjust as Plants Grow

Your plant isn't static. Neither should your light be.

• Seedlings → start close (4–6 inches)

• Juvenile plants → gradually increase distance as they grow

• Mature plants → use the chart above based on light preference

If your light has dimmable brightness, you have even more flexibility:

• Dim + close = intense but gentle

• Bright + far = wide coverage but less intensity

Quick Troubleshooting Flow

Is your plant...
- Bleached / crispy? → Move light farther
- Stretching / tiny leaves? → Move light closer
- Happy and growing? → Don't change a thing

Bottom Line

Distance isn't complicated — but it matters more than almost any other setup step.

Start with the chart. Watch your plant for 1–2 weeks. Adjust if needed.

Within a month, you'll know exactly what your plant wants.

👉 [Shop dimmable full spectrum grow lights — perfect distance control for every plant]