The question has a hidden second half. “Is my plant getting enough light” only becomes answerable once you add “enough for what plant, in what spot”, and almost nothing written on the subject adds it. So the advice arrives as a symptom checklist, and a symptom checklist can only tell you about a decision you already made some weeks ago.
There is a better order. Read the plant for what it is already telling you, then read the spot, then decide whether the two belong together. The rest of this page does those three in that order.
Great fit
This plant should be happy in this spot.
Just the right amount of light
Comfortable temperature
Humidity suits it
Airflow suits it
What the plant is telling you, earliest signal first
Enough for what is a published question too, and the published answers do not agree with each other.
| Published by | The floor it gives | In its own words |
|---|---|---|
| extension.msstate.edu | Under 50 fc | “Usually, an intensity of less than 50 foot-candles will not sustain plant life for very long.” |
| extension.arizona.edu | 25–75 / 75–150 / 150–1000 fc | “In general, there are three categories of light intensity for interior plants: high, 150–1000 foot-candles (fc); medium 75–150 fc; and low, 25–75 fc.” |
| extension.illinois.edu | 75 / 150 / 300 / 1500 fc | Its four bands, verbatim: “Low Light (75 foot candles)”, “Medium (average) Light (150 foot candles)”, “High or Bright Light (300 foot candles)”, “Direct (1500 foot candles)”. |
| extension.psu.edu | 100 footcandles | “a common baseline for low light is 100 footcandles”, with one plant’s own spot measured “as low as 25-foot candles in mid-morning”. |
| extension.msstate.edu | 1,000 fc, then 100 a few feet in | Not a floor but a falloff, from the same source: “The intensity of the light can drop from 1,000 to 100 foot-candles in the distance of only a few feet.” |
These are ordered by how soon they show up. The ones near the top are worth acting on. The ones near the bottom mean the plant has been short of light for a long time.
- New leaves are smaller than the old ones. Usually the first honest signal, and the easiest to miss, because nothing looks wrong. Hold a new leaf against one from last season.
- The gap between leaves is getting longer. Stem stretching toward the window is a light reading with a distance answer. The full version of what the stretch means is here.
- Everything leans one way. A plant that has to reach is telling you the light arrives from one direction and is not abundant enough to ignore.
- Variegation fades. Pale patches cost the plant energy to maintain. In dim conditions it reclaims them and goes greener.
- No new growth for a full season. By this point the plant is holding rather than growing.
- Lower leaves yellow and drop. Late. The plant is retiring leaves that no longer pay for themselves.
Notice what is missing from that list: any way to tell the difference between a spot that is slightly short and a spot that is hopeless. The plant looks the same in both cases for months.
The same seven spots, three different plants
Here is what “enough” looks like when you hold the spot still and change the plant. Every one of these was scored by the same engine that runs the free checker on this site.
| Spot | Estimated light | Snake plant | Golden pothos | Fiddle leaf fig |
|---|---|---|---|---|
| East sill, against the glass | 6,500 lux | Worth a try (69) | Worth a try (67) | Great fit (98) |
| 1 m in from that window | 5,000 lux | Great fit (100) | Great fit (99) | Worth a try (67) |
| 2 m in | 3,150 lux | Great fit (100) | Great fit (100) | Worth a try (64) |
| 3 m in | 1,984 lux | Great fit (100) | Great fit (100) | Not the best fit right now (47) |
| North sill | 3,640 lux | Great fit (100) | Great fit (100) | Worth a try (65) |
| 2 m in from a north window | 1,764 lux | Great fit (100) | Great fit (100) | Not the best fit right now (47) |
| A corner 4 m from any window | 125 lux | Worth a try (63) | Worth a try (63) | Not the best fit right now (45) |
Three things fall out of that table, and none of them survive being compressed into a single rule.
The brightest spot is not the best spot. The snake plant is at its best everywhere except the two extremes, and the east sill is one of the extremes. Moving a tolerant plant closer to the window is not automatically an improvement.
A fiddle leaf fig’s usable range is about one metre wide. Against the glass it is perfect. One step back it is already flagged. This is the plant people describe as dramatic, and the drama is mostly this.
The pothos covers most of the room and then stops. It holds every spot from the glass to the far corner, a north sill included, which is where the reputation for surviving anywhere comes from. It slips at the same two extremes the snake plant does: the east glass, and the corner with no window in reach.
The light figures are estimates built from window direction, distance and typical clear conditions, not meter readings from your home. What travels is the shape: a north window is far brighter than the phrase “low light” suggests, and the spot that actually runs out is the one with no window in reach.
Why your eyes are the wrong instrument
Human vision adjusts continuously and hides exactly the difference that matters. We put a phone down in six places in one ordinary living room on a clear day, and the readings fell far faster than anyone standing in that room would guess:
| Spot | Reading | Foot-candles |
|---|---|---|
| At the bright window | 20,000 lux | about 1,860 fc |
| 1 m from the window | 15,000 lux | about 1,390 fc |
| 2–3 m away, in window shade | 3,500 lux | about 325 fc |
| Middle of the room | 570 lux | about 53 fc |
| Darker side of the room | 119 lux | about 11 fc |
| The dark corner | 18 lux | about 2 fc |
The third column is the same readings on a meter that shows foot-candles, which is what most plant guides quote, and the published bands for what counts as bright indirect light disagree by more than twenty times.
The middle of that room reads as a perfectly pleasant place to sit. For a plant it is about three per cent of the light available at the window. The full six-point measurement, with method and equipment, is here.
The same adjustment is why the seasonal version catches people out: a room at a tenth of its summer brightness still reads as bright enough when you walk into it.
Two ways to read a spot before the plant does
The shadow test, no app and no equipment. Hold your hand about thirty centimetres above the spot around midday and look at what it casts:
| The shadow your hand casts | What the spot is |
|---|---|
| Sharp, dark, crisp-edged | Direct sun |
| Soft-edged but clearly visible | Bright indirect light |
| Faint, fuzzy, barely there | Low light |
| No shadow at all | Too dark for most plants |
The full shadow test is here. It costs nothing and it works in any room, which is the argument for doing it before you buy anything.
A reading, if you want a number. A phone can be used as a light meter, laid flat and screen up at the height the pot will sit, which is a very different measurement from holding it at eye level and pointing it around. The ten-second method and its honest limits are here.
Either one beats waiting for a leaf to tell you, because both of them work on the spot before you commit a plant to it.
So what counts as enough?
For your plant in your spot, the only useful form of the answer is a comparison: this plant, that place, do they fit. That is the question the free checker on this site answers in about thirty seconds, without an install and without an account, and it says so plainly when it does not have enough information to answer rather than inventing a verdict.
If the answer comes back short, the fix is usually one of three, and they are worth trying in this order:
- Move the plant closer to the glass.
- Move it to a different window.
- Change the plant.
The third one is not a defeat. A snake plant on a north sill scores better than a fiddle leaf fig in the same place ever will, and it will look after itself while it does.
By GrowSpot · Published August 2, 2026 · Last updated August 30, 2026
