Stories with Tag Light Therapy

• I tried making artificial sunlight at home

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  Posted: 2025-03-27 19:49:28

  Verbose tl;dr

  Driven by a desire for better indoor lighting, a blogger attempted to recreate sunlight using high-CRI LEDs and a custom-built power supply. He meticulously measured the spectral power distribution of natural sunlight and then combined various LED wavelengths to approximate it. While the resulting light achieved a high CRI and looked visually similar to sunlight, the project was ultimately deemed too complex and expensive for practical home use, especially given the readily available full-spectrum bulbs offering a simpler, albeit less precise, solution. He concluded that accurately replicating sunlight's complexity is a challenging endeavor, even with advanced tools and knowledge.

  Embarking on a quest to replicate the luminous splendor of our celestial sovereign within the confines of his terrestrial abode, the author, Victor Poughon, meticulously documents his fascinating, albeit ultimately imperfect, endeavor. He commences his exposition by elucidating the inherent limitations of conventional artificial lighting, particularly its deficiency in replicating the full spectrum of solar radiation, a crucial element for both physiological and psychological well-being. Driven by a desire to transcend these limitations, Poughon undertakes the ambitious project of constructing a personalized "artificial sun."

  His methodology involves the careful selection and assembly of high-powered light-emitting diodes (LEDs) meticulously chosen to encompass a broad spectrum of wavelengths, thereby approximating the spectral distribution of natural sunlight. This process necessitates a deep dive into the intricacies of color science, including the exploration of concepts such as correlated color temperature (CCT) and color rendering index (CRI), both critical parameters in quantifying the perceptual accuracy of artificial light sources. He meticulously chronicles his procurement of specific LED components, detailing their individual spectral characteristics and rationale for inclusion in his bespoke luminaire.

  The construction process, painstakingly described, involves the integration of these LEDs onto a custom-designed circuit board, carefully managing thermal dissipation to ensure the longevity and optimal performance of the high-output diodes. This technical undertaking necessitates the utilization of specialized equipment and a demonstrable understanding of electrical engineering principles. Poughon further elaborates on the challenges encountered during the fabrication process, including the complexities of achieving uniform light distribution and mitigating undesirable flicker.

  Upon completion of the physical construction, the author proceeds to evaluate the performance of his creation, employing sophisticated instrumentation to measure and analyze the spectral power distribution emitted by the artificial sun. He compares these measurements to reference data for natural sunlight, highlighting both the successes and shortcomings of his endeavor. While acknowledging the limitations of his DIY approach in perfectly replicating the full complexity of solar radiation, Poughon expresses satisfaction with the improved spectral quality of his artificial sun compared to conventional lighting solutions. He concludes by reflecting on the potential benefits of such technology, particularly in environments where access to natural sunlight is restricted, and contemplates future refinements to his design, hinting at the possibility of incorporating dynamic spectral control to mimic the diurnal variations in sunlight.

  • artificial sunlight
  • DIY
  • home experiment
  • Light Therapy
  • SAD
  • sun lamp
  • full spectrum light
  • Lighting
  • Health
  • Science
  • experiment
  • Technology

  Summary of Comments ( 81 )
  https://news.ycombinator.com/item?id=43497394

  Verbose tl;dr

  HN commenters generally praised the author's ingenuity and thorough documentation. Several pointed out potential safety concerns regarding UV exposure and the high-powered LEDs, recommending specific filters and safety precautions. Some discussed alternative approaches using commercially available grow lights or different LED combinations for better spectral accuracy. Others debated the perceived psychological benefits of artificial sunlight and shared their personal experiences with similar projects or seasonal affective disorder. A few commenters delved deeper into the technical aspects, discussing color rendering index (CRI), spectral power distribution, and the challenges of replicating true sunlight. The overall sentiment was one of appreciation for the project's DIY spirit and the author's willingness to share their findings.

  The Hacker News post "I tried making artificial sunlight at home" (https://news.ycombinator.com/item?id=43497394) sparked a discussion with several interesting comments.

  Several users discussed the importance of the spectrum of light for different uses, beyond just perceived brightness. One user pointed out the distinction between CRI (Color Rendering Index) and spectral power distribution (SPD), emphasizing that two light sources can have the same CRI but different SPDs, leading to different effects on things like plant growth or human circadian rhythms. They highlighted the importance of full-spectrum light for these applications. This spurred further discussion on the challenges of truly replicating sunlight's spectrum and intensity, with another commenter mentioning the high cost and complexity involved.

  Another thread explored the potential dangers of high-intensity light sources and the need for proper safety precautions, particularly regarding UV radiation. Users discussed the specific wavelengths of UV light and their different effects, with one commenter cautioning against using untested or unregulated light sources. Another mentioned the potential fire hazards from the high power consumption involved in creating artificial sunlight.

  Some commenters shared their own experiences with artificial sunlight and different lighting technologies, mentioning brands like SolTech and discussing the trade-offs between different approaches. One user shared their positive experience with a specific lamp for Seasonal Affective Disorder (SAD), suggesting that even imperfect replications of sunlight can have beneficial effects.

  There was also a discussion about the author's specific implementation, with some questioning the choice of components and suggesting alternative solutions for achieving a similar effect. One user suggested the use of metal halide lamps as a more efficient way to generate a full-spectrum light source. Another pointed out potential issues with the cooling system used in the author's setup.

  Finally, there were some comments focusing on the practical applications of artificial sunlight, such as indoor gardening and simulating daylight in windowless spaces. One commenter noted the increasing interest in this technology for improving well-being and productivity in environments with limited access to natural light.

• 670nm red light exposure improved aged mitochondrial function, colour vision

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  Posted: 2025-02-16 08:33:47

  Verbose tl;dr

  Exposure to 670nm red light significantly improved declining mitochondrial function and color vision in aged fruit flies. The study found that daily exposure for a short duration revitalized the photoreceptors' mitochondria, increasing ATP production and reducing oxidative stress. This led to demonstrably improved color discrimination ability in older flies, suggesting a potential non-invasive therapy for age-related vision decline.

  A recently published study in Scientific Reports, titled "670nm red light exposure improved aged mitochondrial function and colour vision," meticulously explores the potential rejuvenating effects of long-wavelength red light on declining mitochondrial function and related visual impairments in aged individuals. Specifically, the research focuses on the application of 670 nanometer (nm) wavelength light, a relatively unexplored area in photobiomodulation research, which typically centers around shorter wavelengths like 630nm and 810nm. The study postulates that the age-related decline in mitochondrial function, particularly within the retinal pigment epithelium (RPE) and photoreceptor cells, contributes significantly to diminished visual acuity, specifically in the perception of blue light. This decline is attributed to the increasing inefficiency of cytochrome c oxidase, a critical enzyme in the mitochondrial electron transport chain responsible for energy production.

  The researchers conducted experiments on Drosophila melanogaster (fruit flies), a widely accepted model organism for aging studies due to their comparatively short lifespans and the genetic similarities they share with humans in relation to mitochondrial function. A cohort of flies aged 30 and 45 days – representing middle-aged and older age groups respectively – were exposed to 670nm red light for a defined period daily. Subsequently, the researchers rigorously evaluated several key indicators of mitochondrial health and visual performance.

  Their findings revealed a statistically significant improvement in mitochondrial membrane potential, a key metric of mitochondrial health and energy production capacity, in the older flies exposed to the 670nm light. This suggests a revitalization of mitochondrial function. Furthermore, the researchers observed a substantial and quantifiable improvement in the photoreceptor cells' ability to detect and respond to blue light, effectively enhancing colour vision sensitivity in the treated older flies. The younger flies, interestingly, did not exhibit such pronounced improvements, indicating a targeted effect on age-related decline rather than a general enhancement across all age groups.

  The study proposes that 670nm light stimulates cytochrome c oxidase activity, thereby boosting ATP production and ameliorating the age-related decline in mitochondrial function. This improved mitochondrial performance, in turn, translates to enhanced photoreceptor function and, consequently, better colour vision, specifically in the blue spectrum. While the research offers compelling preliminary evidence, the authors acknowledge the necessity for further investigations, particularly in mammalian models and ultimately human subjects, to validate these findings and to fully elucidate the underlying mechanisms of action behind 670nm light's apparent beneficial effects on age-related visual decline. The findings, however, open up intriguing possibilities for developing non-invasive therapeutic interventions for age-related macular degeneration and other visual impairments linked to mitochondrial dysfunction.

  • mitochondria
  • Red Light Therapy
  • 670nm
  • Aging
  • Vision
  • Color Vision
  • Mitochondrial Function
  • Light Therapy
  • Cellular Health
  • Eye Health
  • Gerontology
  • Biophotonics

  Summary of Comments ( 196 )
  https://news.ycombinator.com/item?id=43066394

  Verbose tl;dr

  HN commenters discuss the study's small sample size (n=24) and the lack of a control group receiving a different wavelength of light. Some express skepticism about the mechanism of action and the generalizability of the results to humans beyond this specific age group (67-85). Others are intrigued by the potential benefits of red light therapy, sharing anecdotal experiences and links to related research, including its use for wound healing and pain relief. Several commenters highlight the affordability and accessibility of red light devices, suggesting self-experimentation while cautioning against potential risks and the need for further research. There's also discussion around the placebo effect and the importance of rigorous scientific methodology.

  The Hacker News post titled "670nm red light exposure improved aged mitochondrial function, colour vision," linking to a Nature article, has a moderate number of comments discussing the research and its implications.

  Several commenters express cautious optimism about the findings, acknowledging the small sample size and the need for further research. They point out the potential benefits of such a simple intervention if proven effective in larger studies. One commenter highlights the distinction between treating the symptoms of aging versus reversing the aging process itself, questioning whether the study demonstrates a true reversal or simply an improvement in function.

  Some users delve into the specifics of the study, discussing the wavelengths of light used and their potential mechanisms of action. One comment mentions the role of cytochrome c oxidase as a photoreceptor and its potential involvement in the observed effects. Another questions the efficacy of commercially available red light devices, pointing out variations in wavelength and power output.

  A few commenters share anecdotal experiences with red light therapy, reporting positive effects on sleep and other health conditions. However, others caution against drawing conclusions from personal anecdotes and emphasize the importance of rigorous scientific evidence.

  Several comments also discuss the accessibility and affordability of red light therapy, with some suggesting it could be a cost-effective intervention if proven effective. Others raise concerns about the potential for misuse and the need for proper regulation of red light devices.

  One thread of conversation revolves around the potential for conflicts of interest, with one commenter noting the involvement of a company selling red light therapy devices. This raises questions about the objectivity of the research and the need for independent replication.

  Finally, some comments offer alternative explanations for the observed effects, such as the placebo effect or other confounding factors. They emphasize the importance of controlled studies to rule out these alternative explanations.