NABAT · THE ILLUSTRATED GUIDE
See light through a leaf.
Follow the light from window or lamp to the leaves, and learn what the plant is telling you.
Explore the guide
Watch & understand
Follow the light into the room
Follow the beam to the leaf. A curtain changes the light, and distance alone does not tell the whole story.
How it works A plant needs enough light across the day to make the sugars that support its growth. A room that looks bright to you can still be dim at leaf level.
LIGHT MAKES FOOD
The leaves need a view of daylight
Leaves use light to turn water and carbon dioxide into sugars. Deep in a room, a plant may receive too little light to support steady growth.
A position comparison, not a light measurement. Changes in growth take days or weeks, not the seconds shown here.
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Watch & understand
Distance changes the light
Lamp output, distance and time work together. Watch the canopy rather than relying on one universal distance.
How it works Both light intensity at the leaves and hours of exposure affect the daily light supply. Fertiliser cannot replace that supply.
WHEN DAYLIGHT IS LIMITED
Add light where the leaves can use it
A grow light can support photosynthesis when daylight is insufficient. Aim it over the canopy; lighting a wall or the floor does little for the leaves.
Use the light maker’s coverage and distance guidance for your plant. The drawn beam and the short day–night cycle are illustrations.
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Watch & understand
Change one thing, then observe
Connect growth clues and a damaged leaf with the conditions around the plant. A symptom needs context.
How it works Light affects the plant’s shape as well as how much it grows. Existing stretched stems and dead patches cannot be repaired by moving a pot.
COLLECT CLUES
Look at growth, not just leaf colour
Compare the newest stems and leaves with older growth of the same plant. Small leaves and unusually long spaces between them can suggest insufficient light.
This shows placement choices. Diagnose from the plant’s recent history and new growth; one yellow or brown leaf cannot identify the cause.
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From the story to your plant
A clean leaf receives the light
Remove dust gently from smooth leaves when needed. Then assess the light in the plant’s actual position.
For this lesson
Sources & review
Reviewed 24 September 2026. Match advice to the species, conditions and product instructions.