Grow light basics

Pick the right light output, schedule, and placement for indoor herbs and greens.

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Quick rules

14-16 hours of light for herbs
6-12 inches above the canopy
Use a timer for consistency

Best for

Indoor herbs, leafy greens, and seedlings.

Simple setup

One bar light over a shelf or a clamp light over a tray.

Decision first

Choose the fixture shape before chasing output numbers

For compact growing, geometry drives success. A strong light that misses half a shelf or hangs awkwardly above a kitchen counter creates uneven growth and daily friction. Decide whether you are lighting a tray, a shelf, or a few pots, then set a timer and adjust distance from plant response.

Fixture choice by setup

Setup	Start with	Verify before buying	Adjustment cue
Shelf herbs	Slim bar	Match shelf width and mounting points	Raise or dim if top leaves curl
Counter pots	Compact panel or bulb fixture	Stable stand, cord path, timer access	Watch heat on nearby walls
Seed trays	Even bar or panel coverage	Light can move as seedlings grow	Lower when seedlings stretch

Placement checklist

Even coverage

Center the light so every pot gets equal exposure.

Heat control

Keep lights high enough to avoid leaf burn.

Rotation

Rotate pots weekly to prevent leaning.

Timer and stress workflow

Start with a repeatable daily schedule and keep a dark period.
Move light closer when stems stretch and leaves stay small.
Raise or reduce intensity when top leaves curl, bleach, or dry faster than the rest of the pot.
Use the LED roundup only after shelf width, mounting, heat, and timer needs are clear.

Choosing the right light

Small shelves

Use a slim bar light with adjustable height.

Countertop herbs

Use a compact panel light on a timer.

Seed starting

Choose higher output and keep the light close.

FAQs

Do I need purple lights?

No. Full-spectrum white LEDs are great for herbs and greens.

How far should the light be?

Start 8-12 inches above leaves, then adjust if plants stretch.

Can I leave lights on all day?

Most herbs do best with a dark period. Stick to 14-16 hours.

Next steps

See LED picks Try hydroponics