Summary of THE LIGHT DOCTOR: Using Light to Boost Health, Improve Sleep, and Live Longer by Dr. Martin Moore-Ede

Posted on by

Light as a health determinant: an expanded review of The Light Doctor by Martin Moore-Ede

Overview and core thesis
Martin Moore-Ede’s The Light Doctor: Using Light to Boost Health, Improve Sleep, and Live Longer argues that light exposure is a primary determinant of human health, on a par with air, water, and food. Published in 2024 by Circadian Books, the book synthesises circadian biology, photobiology, public-health evidence, and building-services practice into a practical programme for “light hygiene” across homes, workplaces, schools, and healthcare settings (Moore-Ede, 2024). The central proposition is simple but profound. Daytime exposure to bright, broad-spectrum light that includes sky-blue wavelengths stabilises circadian timing and supports mood, cognition, metabolism, and longevity. Evening and night-time exposure to the same sky-blue wavelengths disrupts circadian clocks, suppresses melatonin, and elevates risks for cardiometabolic disease, cancer, mood disorders, and earlier mortality. The practical takeaway is equally simple. Bright days, dark nights.

In what follows, I place Moore-Ede’s thesis in an academic context, highlight convergent evidence from large cohorts and laboratory mechanistic work, discuss spectrum gaps in common light sources, outline design and regulatory implications, and propose an applied light-hygiene protocol using contemporary circadian metrics.

The book’s core message is encapsulated in a powerful statement: “the light we see is as important to our health as the air we breathe, the food we eat and the water we drink”

The underlying message is that this is a major environmental problem, but it is also one of the easiest to fix:
just change the darn light bulb.

Essential solutions (Light Hygiene):
1. Get outside every day, particularly in the morning hours, as morning light is the most important time for synchronising the biological clock.
2. If you cannot be outside during the day, use light that has a broader spectrum of wavelengths.
3. At night, remove blue-rich light. Red light at night is superior because it does not trigger the sensitive 480 nm sky blue response.
4. Maintain regularity in sleeping and waking times, as the body is designed for regularity.
5. When using screens at night, blue light blocking glasses can be effective, provided they are sufficiently yellow-orange in color to block the critical sky blue spectrum (many clear, aesthetic blockers are ineffective).

The evolutionary mismatch and why sky-blue matters

For most of human evolution, daily patterns alternated between high-illuminance, broad-spectrum daylight and near-total darkness at night. The modern indoor environment inverts this profile, producing dim days and comparatively bright, blue-rich evenings. In the retina, intrinsically photosensitive retinal ganglion cells express melanopsin with peak sensitivity around the cyan-blue region. Action-spectrum work and downstream physiology demonstrate that short wavelengths near 460 to 480 nm are especially potent in suppressing melatonin, shifting circadian phase, and acutely enhancing alertness at night (Brainard et al., 2001; Thapan et al., 2001; Lockley et al., 2006; Spitschan, 2019). The International Commission on Illumination codified these non-visual responses in CIE S 026, enabling practical quantification via melanopic equivalent daylight illuminance, or melanopic EDI (CIE, 2018; Schlangen & Price, 2021).

In brief, sky-blue enriched light in the morning and through the day is desirable for circadian alignment and performance. The same spectral content after dusk is biologically mistimed and disruptive.

Health consequences of circadian disruption

Mortality, cardiometabolic disease, and mental health
High-quality cohort data now link personal light profiles to health outcomes. In the UK Biobank, actigraphy-derived light exposure from approximately 88,000 individuals shows that brighter days are associated with lower all-cause mortality risk, while brighter nights predict higher mortality, especially from cardiometabolic causes, even after adjustment for sociodemographic and behavioural covariates (Windred et al., 2024; UK Biobank, 2024). Complementary analyses associate outdoor artificial light at night with increased cardiometabolic disease risk and higher natural-cause mortality (Liang et al., 2023; Palomar-Cros et al., 2025). Experimental and observational studies also show that bedroom light at typical “real world” levels increases systemic inflammation and perturbs inflammatory circadian rhythms, mechanisms plausibly linking night light to cardiometabolic pathology (Xu et al., 2024). Parallel work indicates dose-dependent associations between night-time light and incident type 2 diabetes in the same actigraphy-monitored population (Windred et al., 2024; Lancet Regional Health Europe report). Taken together, the epidemiology converges on Moore-Ede’s thesis. Dark nights and bright days matter for survival, not simply sleep quality.

Cancer
The International Agency for Research on Cancer classifies night shift work, which co-varies with chronic circadian disruption and light at night, as “probably carcinogenic to humans” Group 2A, supported by sufficient evidence in animals and strong mechanistic evidence (IARC, 2020; Erren et al., 2019). Mechanistically, light at night suppresses melatonin, a hormone with oncostatic and antioxidant properties, while circadian misalignment dysregulates cell cycle control and DNA repair pathways. Although the aetiology of site-specific cancers is multifactorial, the weight of mechanistic and animal evidence is substantial, with human cohort signals increasingly consistent.

Sleep, mood, and cognition
Low daytime light exposure is associated with poorer sleep, worse mood, and adverse circadian outcomes in community samples, including UK cohorts (Burns et al., 2021). Laboratory studies show short-wavelength light acutely enhances alertness at night but at the cost of melatonin suppression and phase shifts that compromise subsequent sleep and recovery (Lockley et al., 2006).

Watch Martin Moore-Ede’s The Light Doctor: Using Light to Boost Health, Improve Sleep, and Live Longer talk about his book and the importance of light

Spectrum gaps indoors: infrared, ultraviolet, and beyond

Most contemporary indoor lighting is engineered for photopic efficacy and visual appearance rather than biological completeness. Incandescent lamps are inefficient in photopic lumens per watt, but their thermal emission bathes spaces in near-infrared, while common white LEDs use a blue pump and phosphor that generate a visible spectrum with limited near-infrared content and a pronounced short-wavelength peak (Akasaki et al., 2014; Stouch Lighting, 2016; French et al., 2013).

There are three spectrum-health points worth noting.

  1. Near-infrared and photobiomodulation. Red and near-infrared light can modulate mitochondrial cytochrome c oxidase, influencing ATP production, redox signalling, and inflammation. Clinical and preclinical literature supports cautious, application-specific use of red and near-infrared for tissue repair and pain modulation, though dosing and indications require care (Hamblin, 2017; Hamblin, 2018).

  2. Ultraviolet, vitamin D, and ocular development. While excessive UV raises skin-cancer risk, large trials and meta-analyses show that increased outdoor time in childhood reduces myopia onset and progression, likely through bright-light mediated retinal dopamine signalling rather than UV per se (He et al., 2015; Zhang et al., 2019; Ihesiulor et al., 2024). The ecological message remains the same. Children benefit from daily outdoor light.

  3. Narrowband therapeutic wavelengths. Clinical lighting uses specific bands for defined indications. Blue-green around 478 to 490 nm improves neonatal jaundice phototherapy efficacy compared with 452 to 460 nm blue LEDs by aligning better with bilirubin’s absorption and penetration characteristics (Ebbesen et al., 2022; Kato et al., 2020; American Academy of Pediatrics, 2024). Narrow-band green light reduces photophobia and may attenuate migraine intensity in susceptible individuals, although trial quality varies and protocols require refinement (Noseda et al., 2016; Harvard Medical School, 2016; Lipton et al., 2023). Violet-blue 405 nm can reduce environmental bioburden as an adjunct to infection control, distinct from germicidal UV-C (Amodeo et al., 2023; Shehatou et al., 2019).

Dr Martin Moore-Ede on LEDs, circadian disruption, and practical solutions

Dr. Martin Moore-Ede addresses the prevalence of Light Emitting Diodes (LEDs) as a major health challenge stemming from misplaced regulatory priorities and offers specific solutions focused on spectral engineering and light hygiene.

What Dr. Moore-Ede says about LEDs
Dr. Moore-Ede views the widespread adoption of modern LEDs as a significant contributor to the current disease burden. He notes that they have “some particular health challenges to them” and are providing “very artificial very harmful light”.

The core problems with current LEDs are:

  1. Blue-Rich Content and Efficiency: Modern electric lights, particularly LEDs, are “based on a blue pump a blue chip” because this is the “most electrically efficient way” to convert electricity into light. Regulations in North America and Europe have essentially banned older, lower-blue lights (incandescents and halogens) and “enforced Upon Us lights that are very rich in blue”.

  2. Circadian Disruption: This blue-rich light contains the critical sky blue wavelength (440 to 495 nanometers, peaking around 480 nm). When this light is received in the evening or at night, it sends a signal to the Master Clock in the brain (the suprachiasmatic nucleus or SCN) that “it’s still daytime”. This disrupts the body’s natural 24-hour cycle and hormonal rhythms.

  3. Association with Disease: The speaker associates the steep climb in early onset cancers (breast, prostate, colorectal) with the introduction and development of LED lights since about 2015. He urges people to “avoid these Blu Rich LEDs like the plague” because they are causing “a lot of ill disease in the evening hours”.

  4. Lack of Invisible Light: Modern LEDs are engineered solely to produce bright, visible light efficiently, and as a result, they typically lack beneficial invisible light, such as infrared (IR). Older incandescent bulbs naturally produced high quantities of IR, which is highly beneficial, stimulating mitochondrial respiration and improving tissue healing.

What to replace LEDs With and How to Compensate
Dr. Moore-Ede emphasises that the problem is a fixable one: “just change the light bulb”. The solutions involve both prioritising natural light exposure and replacing blue-rich indoor lights with spectrally engineered alternatives.

  1. Harnessing Natural Light
    The absolute best solution is to utilise natural light because “Nature has it there available for you, it’s free”.
    • Get outside every day, particularly in the morning hours, as morning light is the most important time for synchronising the biological clock.
    • If you cannot be outside during the day, use light that has a “broader spectrum of wavelengths in it”.

  2. Spectrally Engineered Solutions (Circadian Lighting)
    For indoor use, especially in the evening and at night, the focus must be on removing the disruptive blue content:
    • Remove Blue Light at Night: At night, you must remove the wavelengths that will disrupt the circadian clock.
    • Use Red Light: Red light at night is superior because it does not trigger the sensitive 480 nm sky blue response. Using red light, such as for an alarm clock dial or when feeding a newborn baby, avoids disrupting melatonin and sleep.
    • Zero Blue Lights: Manufacturers can now “spectrally engineer” light by changing the phosphor coatings on LED chips to produce “effectively zero blue lights”. These zero-blue lights still contain the other colours of the rainbow (like violet) and, even at the same measured brightness, can result in six or seven times more melatonin being produced at night compared to standard blue-rich chips.
    • Add Infrared (IR): He believes there is “real value in adding infrared into light” because of its benefits, such as stimulating mitochondrial respiration and inducing a more relaxed state.

Dr. Moore-Ede confirms he personally implements these changes in his home, using zero blue light bulbs in bedrooms and evening spaces.

  1. Using Blue Light Blockers
    For managing blue light from devices (like screens) at night, blue light blocking glasses can be effective, but with a major qualification:
    • They must be sufficiently opaque, usually yellow-orange in colour, to block the critical sky blue wavelength that affects the circadian clock.
    • Glasses advertised for aesthetics that are relatively clear often “do nothing” because they block the wrong spectrum of blue light.

From principles to practice: metrics, targets, and design

Stop thinking in lumens, start specifying melanopic EDI
Traditional efficacy metrics like lumens per watt privilege green-yellow bands that drive photopic brightness perception. They neither capture circadian potency nor the timing context that determines benefit or harm. The CIE S 026 system defines melanopic EDI and other α-opic quantities that predict ipRGC-influenced responses. Designers can and should specify daytime melanopic EDI targets and evening minimisation thresholds, rather than relying on correlated colour temperature as a proxy (CIE, 2018; Schlangen & Price, 2021).

A practical baseline:

  • Daytime in homes and offices. Aim for at least 200 melanopic lux at the eye for several hours during the daytime as a minimum, with higher values preferred earlier in the day, delivered by daylight or electric light, consistent with WELL Building Standard guidance for circadian lighting design in lived environments (IWBI, n.d.).

  • Evening and night. Minimise melanopic EDI after dusk, ideally below roughly 50 melanopic lux at the eye in living areas, and far lower in bedrooms. Use dim, warm spectra, task lighting, and careful shielding.

Daylight first, then electric light tuned by time and task

  • Architectural daylighting. Prioritise daylight access, window placement, and view quality. Use shading that preserves morning light exposure while controlling glare.

  • Layered electric lighting. Provide separate daytime and evening scenes. Daytime scenes deliver higher vertical illuminance and higher melanopic content at the eye. Evening scenes shift to lower illuminance and lower melanopic content, with localised task lighting.

  • Spectral engineering. Select luminaires with published α-opic data. Avoid blue-rich sources in bedrooms and living areas after dusk. For pathways or night-time care, choose low-illuminance, long-wavelength night lights to preserve circadian darkness while maintaining safety.

Standards and regulations
European workplace standard BS EN 12464-1 sets visual task requirements and acknowledges non-visual needs. Designers can complement it with CIE S 026 metrics to address circadian considerations explicitly (BSI, 2021; Schlangen & Price, 2021). The WELL Standard operationalises melanopic targets for buildings, helping clients bridge science and procurement (IWBI, n.d.). Current ecodesign policy often emphasises lumens per watt, nudging the market toward blue-pumped LED spectra without regard to biological timing. Proposals to tighten minima to 120 to 140 lm/W risk entrenching this bias unless circadian-friendly spectra are explicitly accommodated (PLASA, 2021; EU Commission, n.d.).

A practical light-hygiene protocol

Morning and daytime

  1. Get outside for 20 to 60 minutes of daylight soon after waking. Even overcast UK skies typically provide thousands of lux at the eye and high melanopic EDI, vastly exceeding indoor levels (Burns et al., 2021).

  2. If you must stay indoors, position your workstation near a window. Augment with high-CRI, high-melanopic fixtures that deliver ≥200 melanopic lux vertically at eye level across the morning and early afternoon.

  3. Maintain visual comfort. High melanopic does not mean glare. Use larger luminous areas, indirect components, and matte finishes.

Evening and night

  1. Three hours before bed, dim lights and switch to luminaires with low melanopic output. Prefer table and floor lamps with warm spectra and shades that shield the eye.

  2. In bedrooms, eliminate direct light sources, use blackout blinds, and maintain a true dark environment. If night lighting is needed for safety, use very low-level amber or red sources placed below eye level.

  3. Screens. Use night modes and, if needed, well-validated amber or orange filters that demonstrably block the 460 to 490 nm band. Clear “blue-blocking” glasses are often insufficient. Prioritise behavioural reduction over reliance on filters.

Children and adolescents

  1. Prioritise daily outdoor time to reduce myopia risk and support sleep and mood. School-based trials show that adding 40 minutes outdoors substantially reduces myopia incidence over three years (He et al., 2015; Ihesiulor et al., 2024).

Clinical and special use

  1. Use narrowband therapeutic lighting under professional guidance only, for example neonatal phototherapy at blue-green wavelengths around 478 to 490 nm or migraine-oriented narrow-band green. These are medical interventions, not general ambience (Ebbesen et al., 2022; Noseda et al., 2016).

Implications for procurement, policy, and research

  • Procurement. Require α-opic data in luminaire submittals. Specify daytime and evening scenes with explicit melanopic EDI targets at the eye.

  • Policy. Align energy policy with health by recognising spectrum and timing, not photopic efficacy alone. Encourage market availability of circadian-optimised sources that can still meet sensible energy goals.

  • Research. Continue prospective cohort studies with personal light sensors and health outcomes. Examine dose-response thresholds for melanopic EDI in domestic settings and quantify benefits of practical retrofits at population scale.

Where The Light Doctor fits

Moore-Ede’s book is a timely, practitioner-friendly synthesis that aligns well with the academic literature and the direction of building standards. Its strongest contribution is translational. It turns the high-level rule, bright days and dark nights, into everyday choices about windows, luminaires, switching, and scenes. For those working at the intersection of environmental psychology, health, and design, it is a useful catalyst for shifting clients and colleagues from “colour temperature talk” to circadian metrics and time-of-day lighting.

Table of contents for The Light Doctor

The Light Doctor: Using Light to Boost Health, Improve Sleep, and Live Longer By Martin Moore-Ede

  • Foreword: Questions to Ask Before Switching on the Lights

  • Part 1: Electric Havoc

    1. Edison’s Cancer Epidemic

    2. Goodbye Milky Way

    3. Clockwork Blue

    4. Human Light Interaction

    5. You Have the Right to Healthy Light

  • Part 2: Engineering the Solution
    6. Bringing the Outside Indoors
    7. Tuning to the Right Wavelength
    8. Creating Healthy Light
    9. Lights as Medical Devices.

Author biography

Martin Moore-Ede, M.D., Ph.D. is a physician-scientist and one of the pioneers of circadian biology applied to human health and safety. He served on the Harvard Medical School faculty from 1975 to 1998, leading research on circadian clocks and their implications for sleep, fatigue, metabolic disease, cancer risk, and workplace performance. He later founded and directed industry-facing programmes translating circadian science into lighting and scheduling solutions. Moore-Ede is the author of The Light Doctor and writes widely about healthy lighting for public and professional audiences. His current work focuses on replacing biologically disruptive blue-rich lighting with circadian-aligned solutions in homes, schools, hospitals, workplaces, and eldercare settings. More info from Martin Moore-Ede at his https://lightdoctormartinmooreede.substack.com/

More info: LED lighting

What is good lighting for the best feng shui for your home and workplace?

Why LED lighting is dangerous to your health and not good feng shui?

Electromagnetic Hygiene in 12 Easy Steps – Summary of Light That Heals: Energy Medicine Today & Beyond by Donna Fisher

References

American Academy of Pediatrics. (2024). Phototherapy to prevent severe neonatal hyperbilirubinemia. Pediatrics, 154(3), e2024068026. https://doi.org/10.1542/peds.2024-068026 publications.aap.org

Brainard, G. C., Hanifin, J. P., Greeson, J. M., Byrne, B., Glickman, G., Gerner, E., & Rollag, M. D. (2001). Action spectrum for melatonin regulation in humans. The Journal of Neuroscience, 21(16), 6405-6412. https://doi.org/10.1523/JNEUROSCI.21-16-06405.2001 Journal of Neuroscience

BSI. (2021). BS EN 12464-1:2021 Light and lighting. Lighting of work places. Indoor work places. British Standards Institution. ANSI Webstore

Burns, A. C., Saxena, R., Vetter, C., Phillips, A. J. K., Lane, J. M., Cain, S. W., … Scheer, F. A. J. L. (2021). Time spent in outdoor light is associated with mood, sleep, and circadian-related outcomes. Journal of Affective Disorders, 290, 149-158. https://doi.org/10.1016/j.jad.2021.04.084 PMC

CIE. (2018). CIE S 026/E:2018 CIE system for metrology of optical radiation for ipRGC-influenced responses to light. Commission Internationale de l’Éclairage. cie.co.at+1

Erren, T. C., Groß, J. V., & Meyer-Rochow, V. B. (2019). IARC 2019: Night shift work is probably carcinogenic to humans. Chronobiology International, 36(10), 1517-1519. https://doi.org/10.1080/07420528.2019.1673477 PMC

Ebbesen, F., Gam, J., … (2022). Blue-green (~478 nm) versus blue (~452 nm) light for newborn phototherapy. Children, 9(12), 1903. https://doi.org/10.3390/children9121903 PMC

He, M., Xiang, F., Zeng, Y., Mai, J., Chen, Q., Zhang, J., … Rose, K. (2015). Effect of time spent outdoors at school on the development of myopia among children in China: A randomised clinical trial. JAMA, 314(11), 1142-1148. https://doi.org/10.1001/jama.2015.10803 JAMA Network

IARC. (2020, June 2). IARC Monographs Volume 124: Night shift work. International Agency for Research on Cancer. iarc.who.int

Ihesiulor, C. G., Chen, Y., & Sankaridurg, P. (2024). A review of mechanisms of outdoor exposure in myopia control. Eye and Vision, 11, 14. https://doi.org/10.1186/s40662-024-00391-6 PMC

IWBI. (n.d.). WELL v2, L03 Circadian lighting design. International WELL Building Institute. Retrieved 20 September 2025. standard.wellcertified.com

Kato, S., Hashimoto, Y., & Otsuki, Y. (2020). Standardisation of phototherapy for neonatal hyperbilirubinaemia. Journal of Neonatal-Perinatal Medicine, 13(4), 567-574. https://doi.org/10.3233/NPM-200487 ScienceDirect

Liang, X., Wang, J., … (2023). Outdoor light at night and mortality in the UK Biobank: A prospective cohort study. American Journal of Epidemiology, 193(2), 240-250. https://doi.org/10.1093/aje/kwad275 PubMed

Lipton, R. B., Grosberg, B., … (2023). Narrow-band green light for migraine in real-world practice. Neurology and Therapy, 12, 1479-1495. https://doi.org/10.1007/s40120-023-00532-8 PMC

Lockley, S. W., Brainard, G. C., & Czeisler, C. A. (2006). Short-wavelength sensitivity for the direct effects of light on alertness, vigilance, and the waking EEG in humans. Sleep, 29(2), 161-168. https://doi.org/10.1093/sleep/29.2.161Oxford Academic

Moore-Ede, M. (2024). The light doctor: Using light to boost health, improve sleep, and live longer. Circadian Books. ISBN 979-8990686908. Barnes & Noble+1

Noseda, R., Carder, R. K., … Burstein, R. (2016). Migraine photophobia originating in cone-driven retinal pathways. Brain, 139(7), 1971-1986. https://doi.org/10.1093/brain/aww119 PubMed

Palomar-Cros, A., … (2025). Outdoor artificial light at night and cardiometabolic disease risk. American Journal of Epidemiology, 194(4), 963-974. https://doi.org/10.1093/aje/kwae015 Oxford Academic

PLASA. (2021). Ecodesign updates and minimum energy standards consultation. Professional Lighting and Sound Association. PLASA

Schlangen, L. J. M., & Price, L. (2021). The lighting environment, its metrology, and non-visual effects of light. Current Opinion in Environmental Sustainability, 49, 100571. https://doi.org/10.1016/j.cosust.2021.100571 PMC

Shehatou, C., et al. (2019). Characterising antimicrobial properties of 405 nm light. Photodiagnosis and Photodynamic Therapy, 28, 60-65. https://doi.org/10.1016/j.pdpdt.2019.08.011 PMC

Spitschan, M. (2019). Melanopsin contributions to non-visual and visual function. Current Opinion in Behavioral Sciences, 30, 67-73. https://doi.org/10.1016/j.cobeha.2019.06.003 ScienceDirect

Thapan, K., Arendt, J., & Skene, D. J. (2001). An action spectrum for melatonin suppression. The Journal of Physiology, 535(1), 261-267. https://doi.org/10.1111/j.1469-7793.2001.t01-1-00261.x PubMed

UK Biobank. (2024). Brighter nights and darker days predict higher mortality risk: A prospective analysis of personal light exposure in 88,000 individuals. UK Biobank

Windred, D. P., … (2024). Brighter nights and darker days predict higher mortality risk. Proceedings of the National Academy of Sciences, 121(44), e2405924121. https://doi.org/10.1073/pnas.2405924121 PNAS

Xu, Y., … (2024). Real-ambient bedroom light at night increases systemic inflammation and disrupts circadian rhythm of inflammatory markers. International Immunopharmacology, 132, 110479. https://doi.org/10.1016/j.intimp.2024.110479 ScienceDirect

Zhang, J., et al. (2019). Protective effects of increased outdoor time against myopia. Eye and Vision, 6, 22. https://doi.org/10.1186/s40662-019-0146-2

From Amazon:
“This book terrified me, in the best way. Dr. Moore-Ede is doing cutting-edge work to change the way we think about light and how it affects us.” – Penguin Life

“I was so impressed with his detailed yet thoroughly comprehensible explanations and expert advice! I’ll definitely be changing some of my lightbulbs ASAP!” – Simon Element

The light we see is as important for our health as the food we eat, the water we drink, and the air we breathe. For most of human existence, our ancestors lived with the natural 24-hour light-dark cycle, spending each day in natural daylight and sleeping in the dark at night. But since the widespread introduction of electric light, more than 90% of our time is spent indoors, under unhealthful and human-unfriendly electric light, which disrupts our circadian clocks and greatly increases the risk of cancer, obesity, diabetes, heart disease, and hundreds of other diseases.

Today’s LED fixtures, light bulbs, and screens are designed to produce cheap light with little regard for human health. Like DDT and asbestos, they are dangerously flawed technologies. THE LIGHT DOCTOR reveals extensive scientific evidence establishing the risks of blue-rich artificial light at night. Furthermore, it provides the practical information you need to counteract these risks at home, and in workplaces, schools, hospitals, and senior care facilities.

“I had no idea that artificial lights posed so many health risks, beyond the disruption of sleep. And Dr. Moore-Ede is clearly the leading authority on this topic.” – Spark

“As someone who sits under fluorescent office lights all week, it made me question my life choices! The author does terrific job.” – Tarcher Perigree

Here is how to find and install healthy light bulbs and fixtures for both residential and commercial spaces, how to obtain the lights you need for evening and night use versus daytime, and how to obtain energy-efficient light that is also safe and healthy. You will also learn which outdoor lights to install to avoid harmful effects on wildlife, another inadvertent consequence of the LED revolution.

Posted in Feng shui books reviews.