5 of the best sun lamps: For vitamin D, SAD, and more (2022)

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People commonly use sun lamps, also known as SAD lamps, to treat a form of depression called seasonal affective disorder (SAD). These lamps can also help a person’s body make vitamin D, which helps ensure specific body functions run smoothly.

5 of the best sun lamps: For vitamin D, SAD, and more (1)Share on Pinterest

Quick links

  • Best overall: Verilux HappyLight Luxe
  • Best adjustable lux settings: Aura Day Light Lamp
  • Best for inducing natural sleep and wake: Philips SmartSleep Light Therapy Lamp range
  • Best bulb life: Circadian Optics Lumine Light Therapy Lamp
  • Best for vitamin D: Sperti Vitamin D Sunlamp

Doctors sometimes refer to the use of a sun lamp as light therapy. People with SAD commonly use sun lamps, or lightboxes.

SAD is a type of depression that is more common in the late fall and winter months. Most people who experience it find their symptoms become less severe or even resolve in spring and summer.

Individuals with vitamin D deficiency may also use a SAD lamp. Vitamin D helps the nervous system, muscles, and immune system function correctly. It also assists the body in absorbing the calcium it needs to maintain healthy bones.

Most people receive the vitamin D they need from their diet and the sun. However, those who do not get enough sunlight exposure or have a health condition that stops their body from absorbing vitamins from food might develop a vitamin D deficiency. This can lead to rickets in children, while adults can develop muscle weakness and bone pain.

Sometimes, people also use SAD lamps to help with sleep disorders or depression.

People need sunlight for many reasons. It affects the body’s natural daily cycles, also known as circadian rhythms. These govern how individuals feel and when they go to sleep and wake up.

Sunlight helps the brain produce hormones that the body needs to function. Some examples are serotonin, which plays a role in mood, and melatonin, which helps with sleep patterns. The skin also uses sunlight to make vitamin D.

SAD lamps, also known as sun lamps or light boxes, work by imitating sunlight. These lamps typically show measurements in lux, which refers to the lamp’s luminance level. For example, doctors might recommend that a person with SAD sit by a lightbox that provides 10,000 lux for 30 minutes each day as soon as possible after waking up.

There is some evidence to support the benefits of light therapy, but scientists are not yet sure whether it works.

Additionally, this type of therapy may not suit everyone. People with light sensitivity, bipolar disorder, diabetes, or eye conditions should avoid having the treatment.

Experts advise individuals who wish to try light therapy to use only SAD lamps that emit fluorescent light with no UV wavelengths, which can damage the skin and lead to skin cancer.

However, for people using a SAD lamp to help their skin make vitamin D, UVB light is essential. Anyone considering using a SAD lamp should first speak with a doctor or healthcare professional.

A person looking for a SAD lamp should consider the following factors:

(Video) Sunlight: Optimize Health and Immunity (Light Therapy and Melatonin)

  • Light intensity: An intensity level of 10,000 lux is part of the standard treatment guidelines for light therapy.
  • Positioning: A person should be able to angle their SAD lamps downward to reduce glare.
  • UV filter: Individuals should look for a lamp with a built-in UV filter and UV-blocking capabilities.

There are general guidelines for using a SAD lamp to reduce SAD symptoms. A person may consider:

  • sitting in front of the SAD lamp first thing in the morning
  • using a fluorescent light source with a diffusion screen
  • ensuring 30 minutes of exposure to 10,000 lux
  • angling the SAD lamp to -30 degrees away from the person’s line of sight
  • sitting 12–24 in away from the SAD lamp
  • not looking directly at the bulb
  • starting to use the SAD lamp in the fall and continuing its use through to spring

The following are five of the best SAD lamps to consider purchasing.

Please note that the writer of this article has not tried these products. All information presented is purely research-based and correct at the time of publication.


Medical News Today follows a strict product selection and vetting process. Learn more here.

Best overall: Verilux HappyLight Luxe

pricearound $70
dimensionsheight: 11.7 in
width: 7.5 in
depth: 0.5 in
lamp intensity10,000 lux
weight2 pounds (lb)

Verilux sells a range of HappyLight products, which provide full-spectrum, UV-free light featuring 10,000 lux intensity.

The company’s HappyLight Luxe is portable and comes with adjustable color temperatures, timers, and a choice of four different brightness levels.

People who use the product say it helps improve their mood, sleep patterns, and energy levels.

Individuals may consider the following advantages and disadvantages of this lamp:

Pros

  • three color temperatures: 3,000, 4,000, and 5,000 kelvin
  • countdown timer
  • uses UV-free light

Cons

  • surface area is smaller than recommended guidelines to treat SAD
  • not adjustable
  • light may be less powerful than other models

The Verilux HappyLight Luxe is available to purchase online.

(Video) How to Increase Vitamin D Levels Through the Skin

Best adjustable lux setting: Aura Day Light Lamp

pricearound $140
dimensionsheight: 14 in
width: 8 in
depth: 2 in
lamp intensity3,500–10,000 lux
weightapproximately 1 lb

The Aura Day Light Lamp has an adjustable light output and does not use UV light. Individuals can adjust the lux setting from 3,500 to 10,000, depending on their preference.

A person can also mount the lamp to a wall, and it automatically shuts off after use. The manufacturer advises that its design boosts mood and increases concentration, focus, and energy.

Below are some advantages and drawbacks of the Aura Day Light Lamp for a person to consider.

Pros

  • adjustable angle
  • adjustable light intensity
  • provides UV-free light
  • countdown timer
  • wall-mountable light
  • swivel bottom

Cons

  • light reaches 10,000 lux at a short distance
  • bulbs may burn out quickly
  • higher price without significant quality increase
  • not easy portable

The Aura Day Light Lamp is available to purchase online.

Best for inducing natural sleep and wake: Philips SmartSleep Light Therapy Lamp range

pricearound $50–200
dimensionsvaries
lamp intensity200 lux
weightvaries

Philips designed its SmartSleep Sleep and Wake Up lamps to help people who have difficulty getting to sleep or waking up.

The lamps prepare the body for sleep by simulating sunset, gradually decreasing the light and sound in the room. In the morning, the lamps do the same in reverse by simulating sunrise.

People who use these products say that they help them get to sleep and wake up more naturally, allowing them to feel more energetic during the day.

Individuals may consider the following advantages and disadvantages of this lamp.

Pros

  • a range of available lamps
  • all lamps feature adjustable brightness levels
  • light gradually increases to mimic sunrise
  • higher-end lamps feature a sunset simulation option to promote sleep
  • the design supports natural waking and sleeping

Cons

  • light intensity of 200 lux does not meet standard SAD treatment level guidelines
  • surface area is less than recommended guidelines
  • difficult to adjust for optimal SAD treatment position
  • nonreplaceable bulb
  • the design supports natural waking and sleeping but not SAD specifically
(Video) Do SAD Lamps Stimulate Vitamin D Production?

The Philips SmartSleep Light Therapy Lamp range is available online.

Best bulb life: Circadian Optics Lumine Light Therapy Lamp

pricearound $50
dimensionsheight: 9.5 in
width: 7 in
depth: 2 in
lamp intensity10,000 lux
weight1.69 lb

These lamps do not use UV light. They also come in various designs with an intensity of 10,000 lux. The manufacturer’s design imitates the sun at noon, and a person can adjust the lamp through three brightness levels.

Additionally, rather than fluorescent bulbs, they use light-emitting diodes (LEDs) that have a 50,000-hour life. The lamp also comes with a 2-year warranty.

A person may consider the following advantages and drawbacks of the Lumine lamp:

Pros

  • provides 10,000 lux to meet SAD treatment guidelines on brightness
  • does not use UV light
  • uses LED bulbs that last 50,000 hours
  • three levels of brightness
  • produces white color light

Cons

  • surface area is less than recommended guidelines to treat SAD
  • no timer
  • cannot adjust lighting angle
  • short electric cord

The Circadian Optics Lumine Light Therapy Lamp is available online.

Best for vitamin D: Sperti Vitamin D Sunlamp

pricearound $750
dimensionsheight: 22 in
width: 12 in
depth: 6 in
lamp intensitynot listed
weight 13 lb

The Sperti Vitamin D Sunlamp provides the UVB rays that the body needs to make vitamin D.

According to the manufacturer, it is the only product of its type with recognition from the Food and Drug Administration (FDA).

The device also features an adjustable timer and includes two pairs of UV-blocking glasses to protect the eyes during use. Doctors recommend that people only use it for a few minutes at a time to avoid burns.

Below are some advantages and disadvantages of this lamp.

Pros

  • meets recommended surface area guidelines for SAD treatment
  • adjustable timer
  • 1,000-hour bulb life
  • comes with two pairs of protective eyewear

Cons

  • more expensive than other models
  • brightness is not adjustable
  • produces potentially harmful UVB rays
  • unknown lux levels
(Video) Best Sad Lamps Review in 2022 - Buying Guide For All Budgets

The Sperti Vitamin D Sunlamp is available to purchase online.

PriceFeaturesSizeLight
Verilux HappyLight Luxearound $70three color temperaturesheight: 11.7 in
width: 7.5 in
depth: 0.5 in
10,000 lux
Aura Day Light Lamparound $140suitable for wall mountingheight: 14 in
width: 8 in
depth: 2 in
10,000 lux at a short distance
Philips SmartSleep Light Therapy Lamps$50–200light gradually increases to mimic sunrise varying200 lux
Circadian Optics Lumine Light Therapy Lamparound $50uses LED bulbs that last 50,000 hours height: 9.5 in
width: 7 in
depth: 2 in
10,000 lux
Sperti Vitamin D Sunlamparound $750comes with two pairs of protective eyewear height: 22 in
width: 12 in
depth: 6 in
not listed

Below we look at some common questions relating to SAD lamps.

Can SAD lamps damage your skin or eyes?

A 2017 review recommends that people who take medications that increase their sensitivity to sunlight or who have medical conditions that have the same effect exercise caution when using SAD lamps.

Additionally, those with cataracts, retinopathy, or glaucoma should only use a SAD lamp under the care of an ophthalmologist.

Do SAD lamps increase your vitamin D levels?

According to a 2017 study, lamps that produce UVB light may help a person’s body produce vitamin D. However, future research is necessary to confirm the findings.

If a person has concerns that they have a vitamin D deficiency, they should speak with their doctor as soon as possible.

How long does it take for light therapy lamps to start working?

The exact amount of time it takes to see a reduction in SAD symptoms may vary, but research shows that most people begin to experience symptom relief within 7 days of beginning treatment.

SAD lamps, which work by imitating the sun, may help some people with SAD, vitamin D deficiency, or sleep issues.

However, individuals should be careful when using these devices. In most cases, they should look for products that do not use UV light, as this can damage the skin and lead to skin cancer.

If a person has a vitamin D deficiency, their skin needs UVB light to make the vitamin. However, in most cases, it is better to get vitamin D from food and natural sunlight than to use a SAD lamp.

It is important to note that light therapy will not work for everyone. Those with light sensitivities, bipolar disorder, diabetes, or eye health issues should avoid this treatment.

Anyone thinking about using a SAD lamp, especially those who suspect they have a vitamin D deficiency, should speak with a doctor first.

FAQs

What is the most effective SAD lamp? ›

1. Lumie Vitamin L: The best-value SAD lamp. The Lumie Vitamin L is one of the most energy-efficient SAD lamps around, but the biggest selling point for most people will be the fact that it emits a slightly softer light than other SAD lamps.

Do SAD sun lamps work? ›

Does light therapy work? There's mixed evidence regarding the overall effectiveness of light therapy, but some studies have concluded it's effective, particularly if used first thing in the morning. It's thought that light therapy is best for producing short-term results.

What lamp do I need for vitamin D? ›

In most cases, people should look for products that do not use UV light, as this type of light can damage the skin and lead to skin cancer. If a person has a vitamin D deficiency, their skin needs UVB light to make the vitamin.

Do vitamin D lamps work? ›

Yes, light therapy lamps can help your body make vitamin D, but you shouldn't ignore their risks. They're able to do this because they use UV light, which means spending time under them can increase your risk of skin cancer just as laying out in the sun would.

How long does it take for SAD light to work? ›

Response usually starts in a few days, and by two weeks the symptoms should be definitely improving. Most people need to continue light therapy throughout the winter until the springtime.

How long should I sit in front of my SAD light? ›

Typically, SAD lamps or lights should be used for 30 minutes to an hour. They can be used at any time of the day although they are usually used first thing in the morning. SAD lamps are not regulated by the Food and Drug Administration (FDA).

Can you use a SAD light too much? ›

If you're experiencing both SAD and bipolar disorder, the advisability and timing of using a light box should be carefully reviewed with your health care provider. Increasing exposure too fast or using the light box for too long each time may induce manic symptoms if you have bipolar disorder.

Can I use a SAD lamp at night? ›

Typically, SAD lamps or lights should be used for 30 minutes to an hour. They can be used at any time of the day although they are usually used first thing in the morning. SAD lamps are not regulated by the Food and Drug Administration (FDA).

Do SAD lamps give you vitamin D? ›

Even though it's a light-based therapy, sun lamps don't impact vitamin D production. Be sure to get your vitamin D through your diet and/or supplements as your doctor advises.

How can I raise my vitamin D levels quickly? ›

  1. Spend time in sunlight. Vitamin D is often referred to as “the sunshine vitamin” because the sun is one of the best sources of this nutrient. ...
  2. Consume fatty fish and seafood. ...
  3. Eat more mushrooms. ...
  4. Include egg yolks in your diet. ...
  5. Eat fortified foods. ...
  6. Take a supplement. ...
  7. Try a UV lamp.
17 Mar 2019

How long should you use a sun lamp? ›

Sit in front of the sun lamp for 20 to 30 minutes or the time recommended by the manufacturer or a doctor. Try to use the sun lamp at the same time every day.

Do LED lights give vitamin D? ›

Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight.

How do I choose a SAD lamp? ›

The most important thing to look for in a SAD lamp is the correct amount of light intensity. Every expert agrees on this point: To trigger the brain to release serotonin, a true SAD lamp must have a brightness level of at least 10,000 lux of white light.

What kind of light bulb is closest to sunlight? ›

Halogen Lights

Halogen bulbs are a type of incandescent that gives a close approximation of natural daylight, known as "white light." Colors appear sharper under halogen light and the bulbs can be dimmed.

How long should you use vitamin D lamp? ›

A five minute session is sufficient, and most use their Vitamin D Lamp an average of three times per week. Some individuals cannot tolerate or properly digest and absorb supplements and supplemented foods. Our Vitamin D Lamp provides you with a natural way to get your Vitamin D from short five minute sessions.

What month should you start using a SAD lamp? ›

It's best to tackle the winter blues and SAD as soon as possible! Look out for early signs – often in September or October – and if you start to feel lethargic, anxious or irritable, it might be a good idea to speak to a member of our team about using a SAD lamp.

Is blue or white light better for SAD? ›

Blue light emerges as another effective option for seasonal affective disorder. Narrow-band blue light is as effective as bright white-light for the treatment of seasonal affective disorder (SAD), according to a recent study published online ahead of print in the Journal of Affective Disorders.

Can you use a light therapy lamp all day? ›

Light therapy requires individuals to sit in front of the lamp (about 14 to 24 inches away from your face) daily for 20 to 30 minutes. Researchers recommend to not go over 30 minutes a day. The light therapy causes a chemical change in the brain to produce less melatonin and more serotonin to help improve your mood.

What time of day should you use a SAD light? ›

Five Essential Tips for Using Therapy Lamps for SAD

Light therapy is generally most effective when done early in the morning after waking up. It can also be helpful to use your light again in the late afternoon, especially if you get sleepy between 6-8 PM.

Can you overdo light therapy? ›

Red light therapy is generally considered safe, even though researchers aren't exactly sure how and why it works. And there are no set rules on how much light to use. Too much light may damage skin tissue, but too little might not work as well.

How close should light therapy lamps be? ›

Light therapy should be used for 30 minutes in the morning. Your eyes must be open, but there's no need to stare at the light. Don't get too close. Your light therapy lamp should be placed 12 to 18 inches away from you.

What type of light is used for SAD? ›

While there are light therapy options like dawn stimulators and natural spectrum light bulbs, using a light box (a flatscreen device that uses full-spectrum fluorescent light) is the most common in treating SAD.

Can I use my HappyLight all day? ›

HappyLight® mimics morning sunlight, so it's best to use your HappyLight® before noon. It's not recommended to use it for an extended period of time in the afternoon or evening because bright light suppresses melatonin (the sleep hormone) and may interfere with your sleep.

Where should you position a SAD light? ›

5. Keep the light box at an angle to the left or right, at about 2 o'clock or 10 o'clock. Avoid putting the light directly in front of your eyes. Instead, position it about 45 degrees to the right or left from your midline or eyes.

What color light is best for sleep? ›

What color light helps you sleep? Warm light is better for sleep because the eyes are less sensitive to the longer wavelengths in warm light. Light bulbs with a yellow or red hue and are best for bedside lamps. Blue light, on the other hand, is the worst for sleep.

Are light therapy lamps safe? ›

And even though the risk of eye damage from bright light is low, anyone with diabetes (which can damage the retina) or pre-existing eye disease should check with a doctor before trying light therapy.

Which vitamin D is best for SAD? ›

Vitamin D status improved in both groups (74% vitamin D group, p < 0.005 and 36% phototherapy group, p < 0.01). Improvement in 25-OH D was significantly associated with improvement in depression scale scores (r2=0.26; p=0.05). Vitamin D may be an important treatment for SAD.

How much sun do you need for vitamin D? ›

Regular sun exposure is the most natural way to get enough vitamin D. To maintain healthy blood levels, aim to get 10–30 minutes of midday sunlight, several times per week. People with darker skin may need a little more than this. Your exposure time should depend on how sensitive your skin is to sunlight.

How can I get vitamin D in the winter? ›

Good food sources of vitamin D include fatty fish such as salmon, especially the wild salmon, tuna, mackerel, mushrooms, eggs and vitamin D fortified foods such as milk (any milk will do--cow, soy, almond, or coconut milk are all fortified). My favorite way to get vitamin D in the winter is from salmon.

Which fruit is rich in vitamin D? ›

Orange. There are limited Vitamin D fruits. Around 75% of the people worldwide are either allergic to dairy products or are lactose intolerant, and some of them are vegan. So, orange or orange juice is the best option with vitamin D and other nutrients such as calcium.

What foods have lots of vitamin D? ›

Food Sources
  • Cod liver oil.
  • Salmon.
  • Swordfish.
  • Tuna fish.
  • Orange juice fortified with vitamin D.
  • Dairy and plant milks fortified with vitamin D.
  • Sardines.
  • Beef liver.

How can I check my vitamin D levels at home? ›

At-home tests typically have you prick and squeeze a finger to collect a smaller blood sample. It's easier to measure 25-OH D because it lasts longer in the bloodstream, around 14 days. It's also easier to detect changes in 25-OH D levels associated with vitamin D deficiency.

How do you use a SAD light? ›

Here are some tips for using light therapy:
  1. Get the right light. Your light box should have a 10,000 lux exposure. ...
  2. Avoid staring at the light. Keep the box just off to the side and about a foot away.
  3. Take your time. You should absorb light from your lamp for about a half hour a day. ...
  4. Start in the morning.
9 Dec 2019

What does SAD stand for? ›

Overview - Seasonal affective disorder (SAD)

How can I get sunlight in my room without windows? ›

Choose your lighting fixtures wisely
  1. Cast light evenly with overhead fixtures. ...
  2. Create layers of light with lamps. ...
  3. Add a mirror light to windowless bathrooms. ...
  4. Avoid dark colors and all white. ...
  5. Enlarge rooms with a statement wall. ...
  6. Use LED strips for extra illumination. ...
  7. Bounce light with mirrors.
9 Jun 2021

Which organ in the body does the final step in vitamin D activation? ›

The liver converts vitamin D to 25OHD. The kidney converts 25OHD to 1,25(OH)2D and 24,25(OH)2D. Other tissues contain these enzymes, but the liver is the main source for 25-hydroxylation, and the kidney is the main source for 1α-hydroxylation.

Can you get vitamin D through a window? ›

Virtually all commercial and automobile glass blocks UVB rays. As a result, you will not be able to increase your vitamin D levels by sitting in front of a sunny window, though much of the UVA radiation will penetrate the glass and may be harmful.

Are grow lights harmful to humans? ›

The bottom line is that LED grow lights are no more dangerous than any other type of grow light. HPS is much more dangerous than LEDs – high heat and risk of burns, risk of broken bulbs and fires, high environmental damage due to mercury content, high carbon footprint.

What color light is best for SAD? ›

For this reason, yellow light has been clinically used to treat depression and Seasonal Affective Disorder (SAD). You might try switching your LED lights to a yellow hue during the dark winter months and when you feel down.

Can you use a SAD light too much? ›

If you're experiencing both SAD and bipolar disorder, the advisability and timing of using a light box should be carefully reviewed with your health care provider. Increasing exposure too fast or using the light box for too long each time may induce manic symptoms if you have bipolar disorder.

How many lumens do I need for a SAD light? ›

SAD lamps require a very intense light source with a high color temperature to help mitigate the effects of seasonal depression. These lamps are rated for 5,000 to 10,000 lux (or 10,000 Lumens per square foot), with the majority of lamps favoring 10,000 for good measure.

How do I know if light therapy is working? ›

Monitor your mood to see if it's working.

You should start to notice more energy and an improved mood within one to two weeks with daily use. Many people notice a more immediate response to light therapy. If you are thinking about trying Bright Light Therapy, talk to your doctor first.

How do I choose a SAD lamp? ›

The most important thing to look for in a SAD lamp is the correct amount of light intensity. Every expert agrees on this point: To trigger the brain to release serotonin, a true SAD lamp must have a brightness level of at least 10,000 lux of white light.

What color is best for depression? ›

The colour red is generally said to be associated with an increase in appetite, reduced depression and increased angry feelings, purple with boosting creativity and developing problem-solving skills, orange with optimism, blue with a sense of security and productivity, and green with a sense of harmony and effective ...

What color light helps with anxiety? ›

Green – Quiet and restful, green is a soothing color that can invite harmony and diffuse anxiety. Blue – A highly peaceful color, blue can be especially helpful for stress management because it can encourage a powerful sense of calm. Purple – In many cultures, shades of violet represent strength, wisdom and peace.

What light bulb is closest to sunlight? ›

Halogen Lights

Halogen bulbs are a type of incandescent that gives a close approximation of natural daylight, known as "white light." Colors appear sharper under halogen light and the bulbs can be dimmed.

What type of light is used for SAD? ›

While there are light therapy options like dawn stimulators and natural spectrum light bulbs, using a light box (a flatscreen device that uses full-spectrum fluorescent light) is the most common in treating SAD.

Do SAD lamps cause skin damage? ›

However, it is not the solution; bona fide light therapy works through the eyes, not through the skin.” UV radiation is not an effective treatment for SAD. It can lead to premature skin aging and, worst of all, exposure is a serious risk factor for skin cancer.

Can I use a SAD lamp at night? ›

Typically, SAD lamps or lights should be used for 30 minutes to an hour. They can be used at any time of the day although they are usually used first thing in the morning. SAD lamps are not regulated by the Food and Drug Administration (FDA).

What color temperature is best for SAD? ›

For those affected by Seasonal Affective Disorder (SAD), a lamp that replicates cool daylight has been said to work wonders during the darker months where natural daylight is limited. In those situations, it is recommended that a bedroom lamp which emits a temperature of 5000-6000K with a cool blue hue may work well.

Can you use a light therapy lamp all day? ›

Light therapy requires individuals to sit in front of the lamp (about 14 to 24 inches away from your face) daily for 20 to 30 minutes. Researchers recommend to not go over 30 minutes a day. The light therapy causes a chemical change in the brain to produce less melatonin and more serotonin to help improve your mood.

Does light therapy work on your face? ›

Red LED light therapy may reduce inflammation and stimulate the production of collagen, a protein responsible for younger-looking skin that diminishes with age. Blue LED light therapy may destroy acne-causing bacteria (P. acnes).

Can you use light therapy twice a day? ›

Treatment sessions can last from 15 minutes to three hours, once or twice a day, depending on individual needs and equipment used.

Are light therapy lamps safe? ›

Bright light therapy—also known as phototherapy—is safely used to treat a number of illnesses, but the most common use is for a type of depression called seasonal affective disorder, or SAD.

Videos

1. 5 Awesome Benefits of Light Therapy Lamps & Can They Help Depression?
(Davida Shensky)
2. Bright Light Therapy For Depression SAD Sleep Guide (How Happy Lights Work? Lamp Reviews & Tutorial)
(hoopsmiles)
3. Top 5 Benefits of SUN that ARE NOT Vitamin D
(GuerrillaZen Fitness)
4. Get More Sunlight in The Winter (The Importance of Light in Our Life)
(Fit Father Project - Fitness For Busy Fathers)
5. HappyLights: The SAD Truth
(Greg Yeutter)
6. 8 Signs Your Body Is Begging for Vitamin D
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