Hot Bath and Light Therapy:a Detailed Guide


People often use spas and hot tubs to relax and enjoy the comfort of hot bath. Light therapy, on the other hand, is a medically recognized treatment method that can be used to treat a variety of ailments and also help restore mental health. This article describes their uses and what to look out for.

Principle and Function of the Hot Bath

Spas, hot tubs and jacuzzis can promote physical and mental recovery, which is mainly the effect of hot weatr bath.

Take a hot bath

A hot bath is a healing process where you soak your body in hot water. It effectively relaxes your body and mind, relieves stress, improves your internal circulatory system, and relieves symptoms of arthritis or rheumatism.

In addition, the sulphur content of natural hot springs and the massage effect of Jacuzzi are both beneficial to physical and mental health.

Relaxes Muscles and Promotes Physical Recovery

Hot baths can promote muscle relaxation and reduce spasms caused by muscle contraction.

After a chronic limb injury during exercise, hot compresses or hot water can also be used to reduce pain, increase the elasticity of ligaments and tendons, and increase blood flow. This helps promote physical recovery.

Relieves Mental Stress

When you soak in hot water, your body releases neurotransmitters such as endorphins and dopamine. These chemicals can reduce stress and anxiety and make you feel happy. Soaking in hot water can also promote deep mental relaxation and improve sleep quality.

Improvement of the Circulatory System

The thermal stimulation of a hot bath dilates blood vessels, increases blood flow and improves circulation. This helps ensure that enough oxygen and nutrients reach all parts of the body, while helping to remove waste and toxins. Hot baths are very beneficial for improving the health of the circulatory system.

Hot water promotes blood circulation

Relief from Arthritis and Rheumatism Symptoms

When arthritis and rheumatism strike, localized areas of the body feel distinct discomfort. This often happens during exertion or severe cold, rain and other bad weather.

Hot baths are very beneficial in relieving the symptoms of arthritis and rheumatism. The warmth and buoyancy of the water can relieve pressure on joints and ligaments, reducing joint pain and inflammation.

Sulfur in Hot Springs

Studies have shown that sulphur, which is abundant in some natural hot springs, is effective in treating skin conditions such as rashes and eczema. Some studies also suggest that sulphur can treat arthritis pain and internal problems such as menopausal symptoms and digestive disorders.


Jacuzzis have become increasingly popular since their introduction. In addition to the effect of hot bath, Jacuzzi can also enhance its effect of relaxing the human body and promoting the recovery of bodily functions through water massage.

What do I Need to Pay Attention to When Taking a Hot Bath?

Controlling the Water Temperature

You can adjust the temperature of the water moderately according to your personal preference and tolerance. However, it is best to keep the water temperature moderate and stable. In most cases, experts recommend keeping the water temperature between 37-40 degrees Celsius (98.6-104 degrees Fahrenheit). Water that is too hot can cause discomfort or even skin burns.

Limiting Soaking Time

Experts normally recommend limiting each soak to approximately 15-30 minutes. Prolonged soaking in water that is too hot can lead to dehydration or overheating of the body.

Drink Water

The water temperature in a hot bath is usually higher than your body temperature, which can cause your body to sweat. To avoid dehydration, be sure to stay hydrated.

Drinking water

Take Care of Your Body

Hot baths promote relaxation and increase circulation by warming the body. If you have a chronic medical condition such as heart disease, high blood pressure, or diabetes, it is best to check with your doctor first to see if you can take a long hot bath.

Some people may experience discomfort during the soaking process. If you experience difficulty breathing, dizziness, nausea, rapid heartbeat or other physical discomfort while soaking in a hot bath, stop immediately.

Principles and Benefits of Light Therapy

Light therapy refers to exposing the body directly to sunlight or artificial light and receiving continuous light exposure for a period of time to treat diseases or improve mental conditions.

When different wavelengths of light strike the body, they have different penetrating power and effects on different tissues of the body. This property of light has been used in medicine to develop light therapy for the treatment of disease.

Different wavelengths of light have different penetrating power in human tissues

One theory suggests that the principle of LED light therapy is to use different biological tissues of the body to absorb different wavelengths of light energy and convert them into heat and chemical energy, resulting in a series of chemical reactions in the body to achieve a therapeutic or ameliorative effect. Researchers are still studying the actual principle of action of many light therapies and have not reached a clear conclusion.

People have long discovered and used light therapy to treat disease. The ancient Greeks, Romans, Egyptians, and Chinese all left records of heliotherapy. They developed many applications of light therapy to treat disease or heal the body.

The application scenarios and treatment modalities for phototherapy are still evolving. The following are some of the clinically proven applications of light therapy that have been recognized for their safety and efficacy.

Reduce Jaundice

This is probably the most successful application of light therapy.

Many newborns develop elevated bilirubin levels after birth. Some of these newborns have high bilirubin levels and are at risk for brain damage. Studies have shown that blue light phototherapy can quickly lower bilirubin levels, is very safe, and has few side effects. The use of blue light therapy to treat jaundice is now very common in many hospitals.

Newborns undergoing blue light phototherapy to reduce jaundice

Improving Vitamin D Deficiency

Light can boost the body’s production of vitamin D. Studies have shown that ultraviolet B light-emitting diodes (LEDs) can be used to improve vitamin D deficiency.

Atopic Dermatitis (Eczema) Treatment

Phototherapy can be used for a variety of skin conditions and is considered one of the best treatments for atopic dermatitis (AD). Treatments have been developed for both acute and chronic AD. Clinical studies have shown phototherapy to be safe and effective in the treatment of atopic dermatitis.

Light therapy for skin diseases

Treating chronic circadian rhythm sleep disorder (CRSD)

Studies have shown that introducing the right amount of light can improve sleep disturbances caused by circadian rhythm disorders.

Precautions When Using Phototherapy

Seek Medical Advice

Light therapy used to treat a medical condition must be done under the supervision of a physician. You must consult with your doctor before undergoing phototherapy to understand the treatment options and expected results. Your doctor will be able to design a light therapy program that is appropriate for your condition.

Protecting the Body

Human eyes and genitals are sensitive, so be sure to wear protective goggles and underwear when receiving light therapy. Also, some light treatments can be very irritating to the skin, so it is important to keep the skin clean and moist during this time.

Controlling the Length and Frequency of Exposure

Experts do not recommend receiving longer light therapy sessions to improve the effectiveness of the treatment, even though some people may wish to do so. You must follow a strict science of timing and frequency of light therapy to avoid overstimulating the skin and causing damage.

Cautions about Physical Conditions

Light therapy may cause some adverse physical reactions, such as skin redness, itching, burning, and dryness. Some medications may also increase skin sensitivity and cause the skin symptoms listed above. If you experience any uncomfortable symptoms or adverse reactions, contact your doctor or health care professional immediately.

Are LED Lights Suitable for Light Therapy?

LED lights can be used in everyday life to provide mood lighting and influence our emotions. They can also be used in certain light therapies. This depends specifically on the need for light in the therapy, the requirements of the therapeutic environment and whether the LED product meets the requirements.

Red LEDs used in phototherapy typically require a wavelength of 630-660 nm, while blue LEDs require a wavelength of 415-420 nm. Different treatments use different types of light sources, such as lasers, LEDs, or other specialized light sources.

Red LED for phototherapy

Hot Bath and Light Therapy

Some spas offer light therapy services. However, when light therapy is used to treat certain conditions, it has very stringent requirements for light sources, treatment scenarios, and treatment methods.

Currently, the combination of light therapy and hot bath is still in the research stage. One article in the literature mentions balneophototherapy. This therapy combines bathing with sunlight exposure or light therapy for the treatment of skin disorders.


Spas, hot tubs and jacuzzis can provide hot bath to improve physical and mental health. In contrast, light therapy is more focused on treating physical ailments.

Both hot bath and light therapy are excellent healing methods. Currently, the development of LED lights is ongoing, and research into the combination of light therapy and hot bath continues. This means that LEDs are no longer just for lighting spas, hot tubs and jacuzzis, but can also make a greater contribution to human health in the near future.

WAKING Lighting is a specialist manufacturer of underwater lighting equipment. We manufacture LED underwater lighting products for spas, hot tubs and jacuzzis. If you have any requirements, please do not hesitate to contact us.

Are you looking for a professional underwater light supplier? Contact us now!

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