On a clear day an east sill gets an estimated 6,500 lux, and a peace lily scored there at 22 °C, 50% humidity and light airflow comes back 65 out of 100, flagged as a bit bright. The flag holds out to a metre and a quarter. At a metre and a half the light is down to 3,969 lux and the score jumps to 98.
Read on 14 October 2026, the top results agree on the window and split on the sill. A university extension service calls east ideal, and a UK plant shop calls it perfect because the light won’t burn the leaves. White Flower Farm sets the plant in the window for the morning sun; Tom’s Guide says a few feet back, or the sill only behind a sheer curtain. Further down, a 2019 r/houseplants thread shows a peace lily from an east window with one crispy leaf edge, and the replies say to move it further from the glass.
On our numbers the thread is right about the sill and the guides are right from about five feet back. Where that line falls depends on the month.
Worth a try
It can work here with a little care.
A bit bright, but workable
Comfortable temperature
Humidity suits it
Airflow suits it
Is an east window too bright for a peace lily?
Here is what others publish for a peace lily’s light, copied the way each source prints it. Every figure is a level you’d need a meter to check, in three different units:
| Who publishes it | What it says a peace lily needs | What the figure is |
|---|---|---|
| theplantrunner.com | 800–2,000+ lux | Standard foliage plants (pothos, Philodendron, Monstera deliciosa …) — a general band, not a single-species figure |
| houseplantjournal.com | 100 foot-candles | Peace Lily — minimum indirect light |
| houseplantjournal.com | 200 foot-candles | Peace Lily — good indirect light |
| growlightmeter.com | 5 – 10 PPFD / DLI | Peace Lily |
| extension.arizona.edu | 75–150 foot-candles | listed under the heading "Medium Light (75–150 fc)" |
| houseplantsnook.com | 50–100 foot-candles | chart fc level |
On the sill, a little. The 6,500 lux estimate sits above the top of this plant’s comfortable band, so the light reads a bit bright and the card above stops at 65/100. That’s a warning short of a refusal. At a south window the same plant is refused outright at the glass and needs three metres of floor before the light comes right.
For this plant, the gentle morning light the guides describe earns the same flag as a west sill. On a west wall a peace lily has to go two metres back before the light stops counting against it. East gets there half a metre sooner. On light, that half metre is the practical difference between the two windows for this plant.
How far from an east window should a peace lily be?
About a metre and a half. Here is the plant moved back from the same east window in steps, with an extra step where the score turns:
| Distance from the glass | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| 0.3 m, against the glass | 6,500 lux | A bit bright, but workable | Worth a try, 65/100 |
| 1 m back | 5,000 lux | A bit bright, but workable | Worth a try, 68/100 |
| 1.25 m back | 4,454 lux | A bit bright, but workable | Worth a try, 68/100 |
| 1.5 m back | 3,969 lux | Just the right amount of light | Great fit, 98/100 |
| 2 m back | 3,150 lux | Just the right amount of light | Great fit, 99/100 |
| 3 m back | 1,984 lux | Just the right amount of light | Great fit, 99/100 |
The turn takes a quarter of a metre. At 1.25 m the estimate is 4,454 lux and the score 68; at 1.5 m it’s 3,969 lux and 98. On either side of that step the table hardly moves. Everything from the sill to a metre and a quarter sits within three points, and everything from a metre and a half to three metres within one.
So Tom’s Guide’s “few feet back” points the right way and stops short. Four feet is about 1.2 m, which falls between two flagged rows. Five feet is just over a metre and a half, the first distance where this plant reads a great fit.
The peace lily light page scores an east window at one metre and at three, and the edge sits in the gap between those two rows. The lux figures on both pages are estimates built from window direction, distance and a clear day, not meter readings, so your own step may land a little nearer or further. Wherever it lands, it will be as sudden as this one.
Does the right distance change through the year?
Yes. This is the metre-and-a-half spot from the first table, scored on the 21st of six months at latitude 40:
| Month | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| March | 3,945 lux | Just the right amount of light | Great fit, 98/100 |
| April | 4,556 lux | A bit bright, but workable | Worth a try, 68/100 |
| June | 4,762 lux | A bit bright, but workable | Worth a try, 68/100 |
| August | 4,564 lux | A bit bright, but workable | Worth a try, 68/100 |
| September | 3,957 lux | Just the right amount of light | Great fit, 98/100 |
| December | 2,316 lux | Just the right amount of light | Great fit, 99/100 |
From April to August the score at that spot drops back to 68, level with the one-metre row in the first table, and the estimate peaks at 4,762 lux in June. September brings it back to 98. By December the spot reads 2,316 lux and 99.
The thread with the crispy leaf was posted on the last day of May, in the stretch when even a metre and a half reads a bit bright for this plant.
The rest of the room moves with the calendar too. At the same latitude the east sill reads a great fit only from November to January, and of the distances we scored month by month, two metres is the nearest that keeps a great fit all year. At London’s latitude the flagged months for the metre-and-a-half spot come out the same, April to August.
Why would a peace lily get crispy edges in an east window?
The score can’t look at a leaf, so it can’t settle that thread. It can tell you which suspects were in the room. In late spring the light is flagged at a metre and a half and everywhere closer. And this plant’s humidity flag comes on below 50%, so dry air is the other candidate. The west-window page prints what humidity alone does to the score once the light is right.
Winter flips the problem. Bring the pot to the glass for the dark months and the next thing to check is the cold. On the December sill, 19 °C reads a great fit and 18 °C drops it to worth a try. The scoring reads room air, and the inch of air beside single glazing on a January night can run colder than the thermostat says. A thermometer left on the sill overnight will tell you before the plant does.
Can a sheer curtain keep a peace lily on an east sill?
The scoring has no setting for fabric, so all we can give is the size of the job. Bringing the sill from 6,500 lux down to the 3,969 of the first great-fit row means cutting about two fifths of the light. Whether your sheer manages that is something to measure rather than guess.
Once the peace lily has moved back, the sill is free for a plant that wants the morning beam, and the east window guide sorts plants by how close to that beam each one can go. A north window needs no step back at all: the sill there suits a peace lily as it is, and the cold pane is the thing to watch. Every number here assumes a clear morning at an unshaded window. The free spot checker scores a spot from your description and the weather where you live instead.
Published October 14, 2026
