LightingUnderstanding Light Levels for Indoor Plants
14 min
Topic
Lighting
From bright indirect to low-light corners — a complete guide to identifying light levels in your home and picking plants that will thrive in each spot.
Every plant species evolved under a specific slice of the light spectrum, and indoor lighting is almost always dimmer than the "bright" we perceive. A north-facing window in winter can deliver less than 5% of the light that reaches the understory of a tropical forest — where most popular houseplants originate — which is why light is the single variable most often misjudged at home.
These guides show you how to measure what you actually have (by lux meter, window orientation, or the simple shadow test) and which species match each light tier. When in doubt, move the plant toward the light by a metre and watch for new growth over two to three weeks — plants signal a light deficit long before they look sick.
Guides in lighting
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LightingAcclimating Houseplants to Spring Light (Without Scorching Them)
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LightingNordic Summer Houseplant Care: When 20-Hour Daylight Burns Your Plants
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LightingHow to Measure Light with Your Phone: Lux Meter Apps Tested for Houseplants
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LightingHouseplants for Nordic Winter Darkness: What Survives Stockholm, Oslo, and Helsinki
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Frequently asked questions about lighting
What does "bright indirect light" actually mean?+
Bright indirect light is a spot where you can read a book comfortably during the day without a lamp, but direct sun never lands on the plant — typically within 1–2 metres of a south or west window, or right next to an east window. In lux terms it's roughly 10,000–20,000 lux.
Do houseplants need direct sunlight?+
A few do. Succulents, cacti, citrus, and most flowering plants want 4–6 hours of direct sun daily. Most foliage tropicals (monstera, pothos, philodendron, calathea) will burn in direct sun and prefer bright indirect light.
Are grow lights worth it?+
For any home with only north-facing windows, or for winter in latitudes above ~45°, yes. A 20–40 W full-spectrum LED 30 cm above the plant on a 10–12 hour timer keeps tropical foliage plants growing through months when natural light alone isn't enough.
How can I tell if a plant isn't getting enough light?+
Look for leggy new growth (long gaps between leaves), smaller new leaves than the plant used to produce, pale or yellowing lower leaves, and plants leaning toward the nearest window. These appear within 2–6 weeks of a move to dimmer light.