How many lux does a monstera need?

In our scoring it takes a full hundred anywhere from roughly 2,800 lux to about 10,000. That band covers most of a normal home, which is why so much of the published advice is technically correct and still unhelpful.

Can a monstera get too much light indoors?

Pressed against south glass at around 13,000 lux it comes back flagged as bright rather than ideal. One metre back from the same window scores a full hundred, so the fix is a metre rather than a different room.

How far from a window can a monstera go?

It depends on the window. A metre in from a north window still scores a full hundred, two metres reads as getting dim, and a corner four metres from any window is not enough. From an east or west window it holds much further back.

Is bright indirect light enough for a monstera?

Usually yes, and that phrase is the problem rather than the answer. Bright indirect describes a north sill at 3,640 lux and also a spot two metres into the same room at 1,764, and only one of those scores a full hundred.

How Much Light a Monstera Needs, in Lux

Ask this question and the answers arrive in different units:

Six to twelve hours a day. Hours, with no intensity attached.
Five to eight hours of dappled light. Fewer hours, plus an adjective.
Twelve to sixteen hours under a lamp. Hours again, measured against hardware you would have to buy first.
As much bright indirect light as the plant can possibly get. A direction with no end to it.
5,000 to 7,000 lux for a young plant. The only one you can hold up against a particular spot.

Near the top of the results sits a post from someone who has read all of these, titled with the complaint that the answers keep conflicting, and the first reply predicts it will collect more of the same. The lux figure is the one worth testing, because a number can be wrong in a way that hours and adjectives cannot.

Worked example: Swiss cheese plant (Monstera) right against the glass of a south window, the one spot in the table that is too bright, air 22.5 °C and 50% humidity, medium airflow. Your spot will score differently. Run it for your own spot →

Ten spots, scored

These are indoor spots at typical clear-day conditions, with temperature, humidity and airflow set to the plant's own preferences so that the only thing changing between rows is light.

Spot	Estimated light	What the light is doing	Verdict
South sill, against the glass	13,000 lux	A bit bright, but workable	Worth a try, 68/100
1 m in from a south window	10,000 lux	Just the right amount of light	Great fit, 100/100
West sill	7,800 lux	Just the right amount of light	Great fit, 100/100
East sill	6,500 lux	Just the right amount of light	Great fit, 100/100
1 m in from an east window	5,000 lux	Just the right amount of light	Great fit, 100/100
North sill	3,640 lux	Just the right amount of light	Great fit, 100/100
1 m in from a north window	2,800 lux	Just the right amount of light	Great fit, 100/100
2 m in from a north window	1,764 lux	A little dim, but workable	Worth a try, 68/100
3 m in from a north window	1,111 lux	A little dim, but workable	Worth a try, 66/100
A corner 4 m from any window	125 lux	Too dim here	Not the best fit right now, 45/100

Ten indoor spots at typical clear-day conditions, scored for the same monstera. The spot is what moves here. What does not: the same plant, the same home on the same clear day, with 22.5 °C, 50% humidity and medium airflow on every row. The middle column is only what the light is doing. The verdict is the whole spot, so a plant can have the light it wants and still lose points on warmth, humidity or airflow.

The published range is correct and too narrow to use

Take the 5,000 to 7,000 lux figure to the table. Both ends land on a full hundred, so nothing about it is wrong. But full marks start at 2,800 lux and continue past 10,000, which means the published range describes roughly a quarter of the band where this plant is comfortable.

That matters because of what a narrow range makes you do. A reader who takes 5,000 to 7,000 as the requirement will look at a north sill reading 3,640 and conclude it falls short. It does not. It scores a full hundred, the same as the east sill nearly twice as bright. Told the wider truth, that reader keeps a perfectly good spot instead of buying a lamp for it.

Where it actually stops, at both ends

The two flagged rows are the content of this page, because everything between them is the same answer.

Too bright: pressed against south glass at 13,000 lux, the light reads as bright rather than ideal. Not dangerous, and not a reason to move the plant to another room. One metre back from that same window is a full hundred, so the correction is a metre.

Too dim: a north window holds full marks to about a metre in, then drops to flagged at two metres and stays there. A corner four metres from any window is not enough at all. The dim edge sits at a different distance for every orientation, which is easiest to see by standing in one place and changing the wall the window is in:

The window it is three metres from	Estimated light	Verdict
North window	1,111 lux	Worth a try, 66/100
East window	1,984 lux	Worth a try, 68/100
West window	2,381 lux	Great fit, 100/100
South window	3,969 lux	Great fit, 100/100

One position, four different walls to put the window in. Three metres into the room is a different proposition depending on which one it is. The spot is what moves here. What does not: the same plant, three metres back from the glass, with 22.5 °C, 50% humidity and medium airflow on every row.

Three metres is flagged as dim from a north or an east window and comfortable from a west or a south one. That is the same shape our monstera in a north window page finds from the other direction, and the south-window page covers the bright edge in more detail.

The number is not the answer, and here is the proof

A south sill at 13,000 lux scores 68 for a monstera. On our jade plant page the identical spot, at the identical reading, also scores 68.

The two verdicts have nothing in common. The monstera is flagged because the light is on the bright side of what it wants. The jade is flagged because the light is on the dim side of what it wants. Same window, same lux, same score out of a hundred, opposite problems, and opposite fixes: move the monstera back a metre, move the jade outdoors.

That is the case against reading light figures on their own. A reading describes a place. Whether the place works is a question about the pairing, and there is no lux value you can memorise that answers it for every plant you own.

A monstera scored 66 out of 100 in the GrowSpot app and called Worth a try, with light, temperature, humidity and airflow each marked on its own scale — The same wording as the table above, because it is the same scoring. The four separate scales are why two spots can share a number and mean opposite things: only one of the four is the light.

The advice to summer it outside

It circulates every year and it is aimed at the wrong plant. Here is the same south exposure, with and without the glass:

Where it is standing	Estimated light	Verdict
Indoors, at the window	13,000 lux	Worth a try, 68/100
On a balcony	45,000 lux	Not the best fit right now, 44/100
Outdoors, in the open	80,000 lux	Not the best fit right now, 44/100

The same three places, for a plant that wants the opposite of what a jade wants. The spot is what moves here. What does not: the same plant, the same south exposure, with 22.5 °C, 50% humidity and medium airflow on every row.

The window is doing useful work here rather than getting in the way. This plant evolved under a canopy, and an unshaded balcony hands it several times more light than its band tops out at, which is the reverse of the situation a jade is in.

What to do with a spot you already have

The practical version: if your monstera is anywhere between a north sill and a metre back from a south window, light is not your problem, and whatever is bothering the plant is something else. If it sits against south glass, pull it back an arm's length. If it is more than a metre into a north room, it is on the dim side, and the symptom to watch for is the one on our page about fenestration, where new leaves come in without holes.

If you would rather check the exact place the pot sits, the free spot checker reads it in your browser, and you can lay the phone down where the plant would go.

About this article

The lux figures are our estimates for indoor positions on a clear day, and the verdicts come from the same scoring the app uses. Temperature, humidity and airflow are held at this plant’s own preferred midpoints in every row, so light is the only thing varying; real rooms vary in all four, which is why the checker asks about yours.

Not here: no growth measurements over a season, so nothing above says how fast yours will put out a leaf. Scores on our other pages may differ by a point or two for the same window, because those declare real weather rather than midpoints.

Plant photo credits