Houseplant Light Levels: Where to Actually Put the Plant

Light level is not a property of a room. It is a property of a spot, and it is decided by three things:

Which direction the window faces
How far the plant sits from that window
What is in the way, such as curtains, buildings, trees or an overhang

Change any one and the light level changes. The same room can hold direct sun, bright indirect and low light at the same moment, within three metres of each other.

Distance is the biggest factor

A window is not a lamp shining evenly into a room. Light drops off steeply as you move away from it, and the fall is much faster than it looks:

Distance from the glass	Roughly what is left
At the window	100%
0.5 m	~60%
1 m	~40%
2 m	~20%
3 m	~10%

Those are approximate, and they assume nothing blocking the view of the sky. The practical consequence is what matters: moving a plant from the sill to a table two metres away removes roughly 80% of its light. That is not a small adjustment. It is a change of category.

Window direction

Two of the four are the same everywhere. The other two swap depending on which hemisphere you are in, so they are named here by what they face rather than by compass point:

Window faces	Direct sun	Character
Toward the equator (south-facing in the northern hemisphere, north-facing in the southern)	Most of the middle of the day	The brightest window. Excellent behind a sheer curtain, harsh without
Toward the pole (north-facing in the northern hemisphere, south-facing in the southern)	None	Dimmest but perfectly consistent all day
East	Morning only, roughly 2–4 hours	Gentle. The safest bright window for most foliage plants
West	Afternoon only, roughly 3–5 hours	Bright indirect all morning, then hot late sun that burns harder than morning sun of the same brightness

The placement table

This is the practical answer. Find your window direction along the top, your distance down the side:

Distance	Equator-facing	East	West	Pole-facing
At the glass	Direct sun	Direct sun (am), bright indirect after	Bright indirect (am), direct sun (pm)	Bright indirect
0.5–1 m	Direct to bright indirect	Bright indirect	Bright indirect	Medium to bright indirect
1–2 m	Bright indirect	Medium	Medium to bright indirect	Medium
2–3 m	Medium	Medium to low	Medium	Low
3 m +	Medium to low	Low	Low	Low

So, to answer the question directly: bright indirect is roughly 1–2 m back from an equator-facing window, 0.5–1 m from an east or west window, or right up against a pole-facing one. It is not a windowsill in full sun, and it is not the middle of the room.

Add a sheer curtain to an equator-facing or west window and the whole column shifts one step gentler, and the glass itself becomes bright indirect.

The four levels

Direct sun

The sun's rays fall on the leaves with nothing in between. Above roughly 2,500 lux, and far higher at midday in summer.

Only an unobstructed equator-facing, east or west window produces this indoors, and only for the hours the sun is on that side.

Suits: cacti, most succulents, citrus. Damage in the wrong plant: bleached patches, crisp burns in the middle of the leaf, permanent loss of variegation. Sunburn does not heal.

Bright indirect

The plant has a wide, open view of sky, but no direct rays land on it. Roughly 1,000–2,500 lux.

This is what most foliage houseplants want: Monstera, Philodendron, Alocasia, Calathea, Ficus, Spider Plant. See the placement table above for exactly where it occurs.

Medium

A partial view of sky. Typically 2–3 m from a bright window, or 1–2 m from a pole-facing one, or close to a window that looks onto a wall or fence. Roughly 250–1,000 lux.

Suits: Pothos, ZZ Plant, Dracaena, Sansevieria, Aspidistra. Expect: slower growth, and variegated varieties reverting to plain green because the plant cannot support leaf sections that do not photosynthesise.

Low

Little or no view of sky. An interior hallway, a corner more than 3m from any window, a bathroom with frosted or very small glazing. Roughly 50–250 lux.

Genuinely low-light plants are rare. Most plants labelled "low light" merely tolerate it, declining slowly over a season or two.

Critical adjustment: water considerably less here. A plant in low light uses far less water, so a routine that suited it near a window will rot the roots. Low light kills through wet soil more often than through darkness itself.

Outdoors is a different scale

Worth knowing if you move plants outside for summer: outdoor shade is far brighter than the brightest indoor spot.

Open shade under a tree or a covered porch can be 10,000-20,000 lux, several times the brightest windowsill. Full outdoor sun runs to 100,000.

So a plant that wants bright indirect goes into full shade outdoors, not dappled sun. Moving it from an indoor windowsill to an outdoor "partly shaded" spot is a large jump in intensity, and it will scorch unless acclimatised over a week or two.

What else changes a spot

Season. The sun sits lower and days shorten, so every spot moves one step dimmer for several months. A plant that was fine at 2 m may need to come forward to 1 m.
Obstructions. A balcony overhead, a neighbouring building, or a tree in leaf can halve what a window delivers, regardless of its direction.
Glass and curtains. Net curtains, solar-control and heavily tinted glazing all cut transmitted light noticeably.
Window size. A small window delivers bright indirect over a much shorter distance than a floor-to-ceiling one facing the same way.
Dust. On both the glass and the leaves, and it matters most for plants that have no light to spare.

Checking a spot

Hold your hand about 30 cm above a sheet of white paper at the spot, around midday, and look at the shadow:

Shadow	Level
Sharp and dark, crisp edges	Direct sun
Clear, soft edges	Bright indirect
Faint and fuzzy	Medium
Barely visible or none	Low

Signs the placement is wrong

Too little light

Stretched stems with long gaps between leaves
New leaves smaller than old ones
Variegation fading to plain green
Leaning hard toward the window
No new growth through spring and summer

Too much light

Bleached, washed-out patches
Crisp brown burns in the middle of the leaf
Leaves curling or folding away from the window
Patterning fading or greying

One distinction worth holding onto: brown edges are usually humidity or water quality. Brown patches in the middle of a leaf facing the window are sunburn.