Light therapy (phototherapy) is often presented as a \u201enatural cure\u201c for everything from mood-boosting to skin problems or even nail fungus. Light therapy produces positive biological effects because the body needs light to be healthy. Natural sunlight has been used as a treatment for centuries, although we now know that certain wavelengths can be both beneficial and harmful. For example, ultraviolet (UV) light therapy is used effectively to treat chronic skin conditions. However, exposure to ultraviolet light should only be done in moderation, as it is known to damage cells and even cause skin cancer. Based on years of research, scientists have identified a \u201etherapeutic window\u201c of certain wavelengths \u2013 red and near-infrared light \u2013 that appear to have significant biological benefits without any of the previously mentioned side effects.<\/p>\n\n\n\n
This article provides a clear "map" of the use of light therapy to make it easy to understand, Which light is for whom?<\/strong> and What device is best for this?<\/strong>.<\/p>\n\n\n\n Different wavelengths (colors) of light and different doses cause different biological effects.<\/p>\n\n\n\n This is a classic bright light therapy, most often used for symptoms of seasonal affective disorder (SAD \/ SAS), winter mood swings, and sleep rhythm "desynchronization". The most important thing here is not the "color", but brightness (lux)<\/strong> and usage time (Mayo Clinic)<\/a>.<\/p>\n\n\n\n Common practice protocol: 10,000 lux<\/strong> the device is used in the morning (within 1 hour after waking up)<\/strong> about 20\u201330 minutes<\/strong>, keeping a set distance, without looking directly at the light<\/strong> (Mayo Clinic)<\/a>. Red light is often associated with photobiomodulation<\/strong> (PBM) is not just a "shining LED", but a method in which the dose<\/strong> and power<\/strong>. It is often mentioned for skin condition, discomfort, recovery, and modulation of inflammatory processes, but the results depend largely on the specific protocol and problem (PMC<\/a>).<\/p>\n\n\n\n NIR is often bundled with red light (e.g. 660 nm + 850 nm). Marketing often emphasizes \u201edeeper penetration\u201c, but in reality the most important thing is precise parameters<\/strong> (wavelengths, irradiance, dose, distance, session frequency) and scope. The PBM literature often emphasizes that \u201eone device fits all\u201c is an oversimplified promise (PMC<\/a>).<\/p>\n\n\n\n Blue light has antibacterial effects, which is why it is most often mentioned acne<\/strong> context (sometimes used alone or in combination with red). There are systematic reviews that analyze RCTs and suggest that blue light may be beneficial as an alternative or adjunct, although the magnitude of the effect depends on the protocol and the type of acne (PMC<\/a>).<\/p>\n\n\n\n Important note: \u201etherapeutic blue light\u201c is not the same as blue light from screens \u2013 the spectrum, intensity, and dose are different.<\/p>\n<\/blockquote>\n\n\n\n The green light is particularly interesting migraines<\/strong> on the topic: in clinical studies, green LED exposure has been associated with fewer headache days and improvements in some measures. This is not yet the "gold standard", but the trend has some basis (PubMed<\/a>).<\/p>\n\n\n\n It is more commonly found in cosmetics and \u201eskin soothing\u201c marketing. Clinical evidence is mixed here, so it is best viewed as an adjunct rather than a \u201etreatment.\u201c.<\/p>\n\n\n\n UV phototherapy (e.g., narrowband UVB) is a real medical practice, especially in the treatment of psoriasis, and is usually performed under the supervision of a specialist (American Academy<\/a>). Here are the devices according to their shape and purpose. The same spectrum can be found in several types of devices, so it is most convenient to choose as follows: first the problem \u2192 then the spectrum \u2192 then the device shape<\/strong> .<\/p>\n\n\n\n Lasers, light systems, and sometimes photodynamic techniques are commonly used here. Scientific results show \u201epromising\u201c data, but also emphasize that protocols vary and more large RCTs are needed before this becomes a definitive standard treatment. Choose SAD light box<\/strong> (or a therapy lamp) that actually achieves 10,000 lux<\/strong> at the specified distance, and use in the morning for 20-30 min (according to tolerance) (Mayo Clinic<\/a>).<\/p>\n\n\n\n Choose lady<\/strong> (for the body) or mask<\/strong> (for the face) and look at the parameters, not the marketing: wavelengths, irradiance, dose, distance, recommended protocol (PMC<\/a>).<\/p>\n\n\n\n The most logical thing to do is: blue<\/strong> or blue+red<\/strong> light (masks or hand-held devices). There are systematic reviews that evaluate RCTs and show potential benefits, but consistency and realistic expectations are important (PMC<\/a>).<\/p>\n\n\n\n First of all, confirm the diagnosis (because not every "changed nail" is a fungus). Lasers\/light can be considered as an additional measure, but there is still a lack of a uniform "golden protocol", so it is worth consulting with a specialist (PubMed<\/a>).<\/p>\n\n\n\n Light therapy, also known as phototherapy, is becoming increasingly popular as a natural way to improve mood, reduce symptoms of seasonal affective disorder (SAD), and treat skin disorders. When choosing a light therapy device, pay attention to its key features and consult a specialist.<\/p>\n\n\n\n Light therapy is a group of tools where some areas (e.g., SAD light boxes, medical UV phototherapy) have very clear applications, while others (e.g., nail fungus devices) have promise, but require a sober assessment and often the involvement of a specialist.<\/p>\n\n\n\n
\n\n\n\nA) Types of light (spectrum) and what they are used for<\/h2>\n\n\n\n
1) White bright light (SAD, mood, circadian rhythm)<\/h3>\n\n\n\n
It is also important to note that light boxes for the treatment of SAD are not regulated in the same way as medications<\/strong>, so it is worth choosing carefully.<\/p>\n\n\n\n2) Red light (about 620-700 nm)<\/h3>\n\n\n\n
3) Near infrared (NIR) (approximately 780\u20131100 nm)<\/h3>\n\n\n\n
4) Blue light (around 405\u2013470 nm, often ~415 nm)<\/h3>\n\n\n\n
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5) Green light (about 520-560 nm)<\/h3>\n\n\n\n
6) Yellow\/amber (around 570-590 nm)<\/h3>\n\n\n\n
7) UV (UVA\/UVB) \u2013 medical phototherapy<\/h3>\n\n\n\n
It is important not to confuse it with a solarium: solariums emit more UVA and increase the risk of skin cancer - it is not a safe "substitute for treatment".<\/p>\n\n\n\n
\n\n\n\nB) Types of light therapy devices (separately from spectrum)<\/h2>\n\n\n\n
1) SAD light boxes (Light box)<\/h3>\n\n\n\n
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2) Therapeutic table\/floor lamps (for SAD mode)<\/h3>\n\n\n\n
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3) LED panels (red\/NIR for photobiomodulation)<\/h3>\n\n\n\n
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4) LED masks (for the face)<\/h3>\n\n\n\n
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5) Handheld spot devices (for local application)<\/h3>\n\n\n\n
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6) Wearable devices (glasses and other wearables)<\/h3>\n\n\n\n
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7) Devices for nail fungus (onychomycosis)<\/h3>\n\n\n\n
Photodynamic therapy (aPDT) and combinations with antifungal drugs appear promising in some reviews, especially as a combination regimen (PubMed<\/a>).<\/p>\n\n\n\n8) Medical UV equipment (clinical phototherapy)<\/h3>\n\n\n\n
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\n\n\n\nHow to choose correctly (usually)<\/h2>\n\n\n\n
If the goal is winter mood, energy, sleep<\/h3>\n\n\n\n
If the goal is red\/NIR (recovery, discomfort, skin)<\/h3>\n\n\n\n
If the goal is acne<\/h3>\n\n\n\n
If the goal is nail fungus<\/h3>\n\n\n\n
\n\n\n\nConclusion<\/strong><\/h2>\n\n\n\n