The LONVIA Edit
Curated insights on space, health, investment, and the future of living.
At home
Light the activity, not the room: a five-minute evening light audit
The LONVIA
Edit
Curated insights on space, health, investment, and the future of living.
At home
Light the activity, not the room: a five-minute evening light audit
8 min read
Most homes already contain everything required for a better evening. The difficulty is not the bulbs. It is where the light comes from. When daylight goes, the majority of rooms switch to ceiling fixtures, pendants and rows of downlights that fill the whole space. The fix costs nothing and takes five minutes.
Why does the ceiling fixture cause the problem?
Because of geometry, before anything else.
An overhead fitting sits in the upper visual field, which is the part of the retina that daylight normally occupies. It is the position the circadian system is most sensitive to, for the straightforward reason that in daylight the bright half of the world is above you. A source placed there is read as sky.
Distance compounds it. Illuminance falls with the square of the distance from the source, so a fitting three metres overhead has to run considerably harder than a lamp at arm’s length to light the same page. Halve the distance and you need roughly a quarter of the output. The overhead position is the least efficient place to put evening light and, at the eye, the most expensive.
Then there is coverage. Downlights and pendants are designed to illuminate an entire room evenly. After dark, even illumination is precisely the wrong objective. You are lighting forty square metres in order to read one page.
Light the activity, not the entire room.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
How do you run the audit?
Step three matters more than it appears. A visible bulb places a small, intensely bright source directly in your line of sight, and what reaches the retina depends on what you can see, not on what the room measures on average. Shading a lamp changes the number at your eye without changing the number in the room.
Why does a warm-looking room still fail the test?
Because colour is a description of appearance, not a measure of biological load.
A room can look warm and low and still deliver a great deal of light to the eye. A 2700K source at ordinary room brightness commonly sits between 45 and 90 melanopic equivalent daylight illuminance lux, against the 10 mEDI lux ceiling that Brown et al. 2022 recommends for the three hours before sleep. The appearance is correct and the dose is not.
So the test is not whether the room looks warm. It is whether the room feels layered rather than uniformly bright. A good evening room does not have to be dark. It has to be uneven.
What does this not fix?
Two things, and it is worth being clear about both.
It does not address the daytime side. Rearranging lamps in the evening does nothing about the roughly 90 per cent of the day spent indoors under 200 mEDI lux, against a recommended daytime minimum of 250. That gap is closed by getting outside in the morning, or eventually by light engineered to deliver it.
And it does not change spectrum. Moving a lamp lower and closer reduces how much reaches your eyes. It does not alter what the source emits. Position is the variable available to you tonight with the lamps you already own. Spectrum is the variable that requires different hardware.
Run the audit anyway. It is free, it takes five minutes, and it is the single largest improvement most homes can make to their evening light without buying anything.
With light,
Roksana Fasovska
LONVIA Founder
Frequently asked questions
How dim should a room be in the evening?
Brown et al. 2022 recommends staying below 10 mEDI lux at the eye in the three hours before sleep, and at or below 1 mEDI lux during sleep. That is a measure of what reaches the eye, not a description of how dark the room appears.
Is it better to dim the ceiling light or switch to a table lamp?
The table lamp, in most rooms. Dimming reduces output from a position that remains overhead and in the upper visual field. A low, close lamp lights the same task with far less output, because illuminance falls with the square of distance.
Does the room have to be dark?
No. The objective is uneven rather than dark. You should be able to read and hold a conversation comfortably, with the edges of the room left unlit.
Do warm bulbs solve the evening problem on their own?
Not on their own. Colour temperature describes appearance rather than melanopic content. A warm source at usable room brightness frequently sits well above the 10 mEDI evening threshold
References
1. Brown TM, Brainard GJ, Cajochen C, et al. Recommendations for daytime, evening, and night-time indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLOS Biology. 2022;20(3):e3001571.
2. International Commission on Illumination (CIE). CIE S 026/E:2018. CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Vienna: CIE; 2018.
3. Zeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology. 2000;526(3):695-702.
4. Phillips AJK, Vidafar P, Burns AC, et al. High sensitivity and interindividual variability in the response of the human circadian system to evening light. Proceedings of the National Academy of Sciences of the United States of America. 2019;116(24):12019-12024.
Ready to shape a healthier future?
Book an introductory conversation to explore how well-being can be integrated into your space or project
Ready to shape a healthier future?
Book an introductory conversation to explore how well-being can be integrated into your space or project
Ready to shape a healthier future?
Book an introductory conversation to explore how well-being can be integrated into your space or project
8 min read
Key Insight
Most homes already contain everything required for a better evening. The difficulty is not the bulbs. It is where the light comes from. When daylight goes, the majority of rooms switch to ceiling fixtures, pendants and rows of downlights that fill the whole space. The fix costs nothing and takes five minutes.
Most homes already contain everything required for a better evening. The difficulty is not the bulbs. It is where the light comes from. When daylight goes, the majority of rooms switch to ceiling fixtures, pendants and rows of downlights that fill the whole space. The fix costs nothing and takes five minutes.
Why does the ceiling fixture cause the problem?
Because of geometry, before anything else.
An overhead fitting sits in the upper visual field, which is the part of the retina that daylight normally occupies. It is the position the circadian system is most sensitive to, for the straightforward reason that in daylight the bright half of the world is above you. A source placed there is read as sky.
Distance compounds it. Illuminance falls with the square of the distance from the source, so a fitting three metres overhead has to run considerably harder than a lamp at arm’s length to light the same page. Halve the distance and you need roughly a quarter of the output. The overhead position is the least efficient place to put evening light and, at the eye, the most expensive.
Then there is coverage. Downlights and pendants are designed to illuminate an entire room evenly. After dark, even illumination is precisely the wrong objective. You are lighting forty square metres in order to read one page.
Light the activity, not the entire room.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
Why does the ceiling fixture cause the problem?
Because of geometry, before anything else.
An overhead fitting sits in the upper visual field, which is the part of the retina that daylight normally occupies. It is the position the circadian system is most sensitive to, for the straightforward reason that in daylight the bright half of the world is above you. A source placed there is read as sky.
Distance compounds it. Illuminance falls with the square of the distance from the source, so a fitting three metres overhead has to run considerably harder than a lamp at arm’s length to light the same page. Halve the distance and you need roughly a quarter of the output. The overhead position is the least efficient place to put evening light and, at the eye, the most expensive.
Then there is coverage. Downlights and pendants are designed to illuminate an entire room evenly. After dark, even illumination is precisely the wrong objective. You are lighting forty square metres in order to read one page.
Light the activity, not the entire room.
How do you run the audit?
Step three matters more than it appears. A visible bulb places a small, intensely bright source directly in your line of sight, and what reaches the retina depends on what you can see, not on what the room measures on average. Shading a lamp changes the number at your eye without changing the number in the room.
How do you run the audit?
Step three matters more than it appears. A visible bulb places a small, intensely bright source directly in your line of sight, and what reaches the retina depends on what you can see, not on what the room measures on average. Shading a lamp changes the number at your eye without changing the number in the room.
Why does a warm-looking room still fail the test?
Because colour is a description of appearance, not a measure of biological load.
A room can look warm and low and still deliver a great deal of light to the eye. A 2700K source at ordinary room brightness commonly sits between 45 and 90 melanopic equivalent daylight illuminance lux, against the 10 mEDI lux ceiling that Brown et al. 2022 recommends for the three hours before sleep. The appearance is correct and the dose is not.
So the test is not whether the room looks warm. It is whether the room feels layered rather than uniformly bright. A good evening room does not have to be dark. It has to be uneven.
Why does a warm-looking room still fail the test?
Because colour is a description of appearance, not a measure of biological load.
A room can look warm and low and still deliver a great deal of light to the eye. A 2700K source at ordinary room brightness commonly sits between 45 and 90 melanopic equivalent daylight illuminance lux, against the 10 mEDI lux ceiling that Brown et al. 2022 recommends for the three hours before sleep. The appearance is correct and the dose is not.
So the test is not whether the room looks warm. It is whether the room feels layered rather than uniformly bright. A good evening room does not have to be dark. It has to be uneven.
What does this not fix?
Two things, and it is worth being clear about both.
It does not address the daytime side. Rearranging lamps in the evening does nothing about the roughly 90 per cent of the day spent indoors under 200 mEDI lux, against a recommended daytime minimum of 250. That gap is closed by getting outside in the morning, or eventually by light engineered to deliver it.
And it does not change spectrum. Moving a lamp lower and closer reduces how much reaches your eyes. It does not alter what the source emits. Position is the variable available to you tonight with the lamps you already own. Spectrum is the variable that requires different hardware.
Run the audit anyway. It is free, it takes five minutes, and it is the single largest improvement most homes can make to their evening light without buying anything.
What does this not fix?
Two things, and it is worth being clear about both.
It does not address the daytime side. Rearranging lamps in the evening does nothing about the roughly 90 per cent of the day spent indoors under 200 mEDI lux, against a recommended daytime minimum of 250. That gap is closed by getting outside in the morning, or eventually by light engineered to deliver it.
And it does not change spectrum. Moving a lamp lower and closer reduces how much reaches your eyes. It does not alter what the source emits. Position is the variable available to you tonight with the lamps you already own. Spectrum is the variable that requires different hardware.
Run the audit anyway. It is free, it takes five minutes, and it is the single largest improvement most homes can make to their evening light without buying anything.
Frequently asked questions
How dim should a room be in the evening?
Brown et al. 2022 recommends staying below 10 mEDI lux at the eye in the three hours before sleep, and at or below 1 mEDI lux during sleep. That is a measure of what reaches the eye, not a description of how dark the room appears.
Is it better to dim the ceiling light or switch to a table lamp?
The table lamp, in most rooms. Dimming reduces output from a position that remains overhead and in the upper visual field. A low, close lamp lights the same task with far less output, because illuminance falls with the square of distance.
Does the room have to be dark?
No. The objective is uneven rather than dark. You should be able to read and hold a conversation comfortably, with the edges of the room left unlit.
Do warm bulbs solve the evening problem on their own?
Not on their own. Colour temperature describes appearance rather than melanopic content. A warm source at usable room brightness frequently sits well above the 10 mEDI evening threshold
References
1. Brown TM, Brainard GJ, Cajochen C, et al. Recommendations for daytime, evening, and night-time indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLOS Biology. 2022;20(3):e3001571.
2. International Commission on Illumination (CIE). CIE S 026/E:2018. CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Vienna: CIE; 2018.
3. Zeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology. 2000;526(3):695-702.
4. Phillips AJK, Vidafar P, Burns AC, et al. High sensitivity and interindividual variability in the response of the human circadian system to evening light. Proceedings of the National Academy of Sciences of the United States of America. 2019;116(24):12019-12024.
References
1. Brown TM, Brainard GJ, Cajochen C, et al. Recommendations for daytime, evening, and night-time indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLOS Biology. 2022;20(3):e3001571.
2. International Commission on Illumination (CIE). CIE S 026/E:2018. CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Vienna: CIE; 2018.
3. Zeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology. 2000;526(3):695-702.
4. Phillips AJK, Vidafar P, Burns AC, et al. High sensitivity and interindividual variability in the response of the human circadian system to evening light. Proceedings of the National Academy of Sciences of the United States of America. 2019;116(24):12019-12024.
With light,
Roksana Fasovska
Roksana Fasovska
LONVIA Founder
At home
Light the activity, not the room: a five-minute evening light audit
8 min read
Most homes already contain everything required for a better evening. The difficulty is not the bulbs. It is where the light comes from. When daylight goes, the majority of rooms switch to ceiling fixtures, pendants and rows of downlights that fill the whole space. The fix costs nothing and takes five minutes.
Key Insight
Why does the ceiling fixture cause the problem?
Because of geometry, before anything else.
An overhead fitting sits in the upper visual field, which is the part of the retina that daylight normally occupies. It is the position the circadian system is most sensitive to, for the straightforward reason that in daylight the bright half of the world is above you. A source placed there is read as sky.
Distance compounds it. Illuminance falls with the square of the distance from the source, so a fitting three metres overhead has to run considerably harder than a lamp at arm’s length to light the same page. Halve the distance and you need roughly a quarter of the output. The overhead position is the least efficient place to put evening light and, at the eye, the most expensive.
Then there is coverage. Downlights and pendants are designed to illuminate an entire room evenly. After dark, even illumination is precisely the wrong objective. You are lighting forty square metres in order to read one page.
Light the activity, not the entire room.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
What does that mean in practice?
Keep evening light low, close and local.
Put the light beside the sofa, on the dining table, next to the chair you actually sit in. Let it illuminate what you are doing rather than every corner of the room. Several small areas of light read as a considered room. One ceiling fitting read as an office.
This is not a compromise on how the room looks. Layered, local lighting is what interior designers have recommended for decades on purely visual grounds. The biology and the aesthetics point the same way here, which is unusual and worth using.
Why does the ceiling fixture cause the problem?
Because of geometry, before anything else.
An overhead fitting sits in the upper visual field, which is the part of the retina that daylight normally occupies. It is the position the circadian system is most sensitive to, for the straightforward reason that in daylight the bright half of the world is above you. A source placed there is read as sky.
Distance compounds it. Illuminance falls with the square of the distance from the source, so a fitting three metres overhead has to run considerably harder than a lamp at arm’s length to light the same page. Halve the distance and you need roughly a quarter of the output. The overhead position is the least efficient place to put evening light and, at the eye, the most expensive.
Then there is coverage. Downlights and pendants are designed to illuminate an entire room evenly. After dark, even illumination is precisely the wrong objective. You are lighting forty square metres in order to read one page.
Light the activity, not the entire room.
How do you run the audit?
Step three matters more than it appears. A visible bulb places a small, intensely bright source directly in your line of sight, and what reaches the retina depends on what you can see, not on what the room measures on average. Shading a lamp changes the number at your eye without changing the number in the room.
How do you run the audit?
Step three matters more than it appears. A visible bulb places a small, intensely bright source directly in your line of sight, and what reaches the retina depends on what you can see, not on what the room measures on average. Shading a lamp changes the number at your eye without changing the number in the room.
Why does a warm-looking room still fail the test?
Because colour is a description of appearance, not a measure of biological load.
A room can look warm and low and still deliver a great deal of light to the eye. A 2700K source at ordinary room brightness commonly sits between 45 and 90 melanopic equivalent daylight illuminance lux, against the 10 mEDI lux ceiling that Brown et al. 2022 recommends for the three hours before sleep. The appearance is correct and the dose is not.
So the test is not whether the room looks warm. It is whether the room feels layered rather than uniformly bright. A good evening room does not have to be dark. It has to be uneven.
Why does a warm-looking room still fail the test?
Because colour is a description of appearance, not a measure of biological load.
A room can look warm and low and still deliver a great deal of light to the eye. A 2700K source at ordinary room brightness commonly sits between 45 and 90 melanopic equivalent daylight illuminance lux, against the 10 mEDI lux ceiling that Brown et al. 2022 recommends for the three hours before sleep. The appearance is correct and the dose is not.
So the test is not whether the room looks warm. It is whether the room feels layered rather than uniformly bright. A good evening room does not have to be dark. It has to be uneven.
What does this not fix?
Two things, and it is worth being clear about both.
It does not address the daytime side. Rearranging lamps in the evening does nothing about the roughly 90 per cent of the day spent indoors under 200 mEDI lux, against a recommended daytime minimum of 250. That gap is closed by getting outside in the morning, or eventually by light engineered to deliver it.
And it does not change spectrum. Moving a lamp lower and closer reduces how much reaches your eyes. It does not alter what the source emits. Position is the variable available to you tonight with the lamps you already own. Spectrum is the variable that requires different hardware.
Run the audit anyway. It is free, it takes five minutes, and it is the single largest improvement most homes can make to their evening light without buying anything.
What does this not fix?
Two things, and it is worth being clear about both.
It does not address the daytime side. Rearranging lamps in the evening does nothing about the roughly 90 per cent of the day spent indoors under 200 mEDI lux, against a recommended daytime minimum of 250. That gap is closed by getting outside in the morning, or eventually by light engineered to deliver it.
And it does not change spectrum. Moving a lamp lower and closer reduces how much reaches your eyes. It does not alter what the source emits. Position is the variable available to you tonight with the lamps you already own. Spectrum is the variable that requires different hardware.
Run the audit anyway. It is free, it takes five minutes, and it is the single largest improvement most homes can make to their evening light without buying anything.
Frequently asked questions
How dim should a room be in the evening?
Brown et al. 2022 recommends staying below 10 mEDI lux at the eye in the three hours before sleep, and at or below 1 mEDI lux during sleep. That is a measure of what reaches the eye, not a description of how dark the room appears.
Is it better to dim the ceiling light or switch to a table lamp?
The table lamp, in most rooms. Dimming reduces output from a position that remains overhead and in the upper visual field. A low, close lamp lights the same task with far less output, because illuminance falls with the square of distance.
Does the room have to be dark?
No. The objective is uneven rather than dark. You should be able to read and hold a conversation comfortably, with the edges of the room left unlit.
Do warm bulbs solve the evening problem on their own?
Not on their own. Colour temperature describes appearance rather than melanopic content. A warm source at usable room brightness frequently sits well above the 10 mEDI evening threshold
References
1. Brown TM, Brainard GJ, Cajochen C, et al. Recommendations for daytime, evening, and night-time indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLOS Biology. 2022;20(3):e3001571.
2. International Commission on Illumination (CIE). CIE S 026/E:2018. CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Vienna: CIE; 2018.
3. Zeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology. 2000;526(3):695-702.
4. Phillips AJK, Vidafar P, Burns AC, et al. High sensitivity and interindividual variability in the response of the human circadian system to evening light. Proceedings of the National Academy of Sciences of the United States of America. 2019;116(24):12019-12024.
References
1. Brown TM, Brainard GJ, Cajochen C, et al. Recommendations for daytime, evening, and night-time indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLOS Biology. 2022;20(3):e3001571.
2. International Commission on Illumination (CIE). CIE S 026/E:2018. CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Vienna: CIE; 2018.
3. Zeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology. 2000;526(3):695-702.
4. Phillips AJK, Vidafar P, Burns AC, et al. High sensitivity and interindividual variability in the response of the human circadian system to evening light. Proceedings of the National Academy of Sciences of the United States of America. 2019;116(24):12019-12024.
Roksana Fasovska
LONVIA Founder
With light,