How efficient are blue LEDs?
The theoretical maximum efficiency occurs when all input energy is converted to energy in photosynthetic photons. Blue LEDs can be 93% efficient, phosphor-converted “whites” 76% efficient, and red LEDs 81% efficient.
While energy conversion efficiency of incandescent lamps is between 10 and 20 percent, highly efficient LEDs currently achieve values between 40 and 50 percent. Nevertheless, this means that 50 to 60 percent of the power is lost as heat.
Strategically timed exposure to blue light can help treat several sleep disorders. Circadian rhythm disorders occur when a person's circadian rhythms are not in alignment with their environment. Light therapy, and blue light in particular. View Source , can help realign the body's circadian rhythms and improve sleep.
The most efficacious LEDs have very high correlated color temperatures (CCTs), often above 5000K, producing a “cold” bluish light. However, warm white LEDs (2600K to 3500K) have improved significantly, now approaching the efficacy of CFLs.
Blue light waves come from fluorescent and LED lights and back-lit electronic screens on televisions, computers, tablets, and cell phones. Remember, exposure to these lighted screens during the sensitive period can make it difficult for you to fall asleep at night or can wake you up too early.
LEDs have a longer lifespan, emit less heat, and use less electricity than both incandescent and compact fluorescent light sources. The invention of blue LEDs meant that blue, red, and green could all be combined to produce white LED light, which can function as an alternative energy-saving light source.
Top Performance LEDs: These LEDs have the highest luminous efficacy, around 220 lm/w. Examples include the Nichia 757G LEDs. High Performance LEDs: These LEDs offer good performance with a luminous efficacy of 150-200 lm/w. Many reputable manufacturers produce LEDs in this category.
Energy Efficiency with LED Bulbs
That is because these bulbs produce a majority of their energy as heat, not light. LEDs are better, on the other hand, in producing very little heat in order to light your home. As a result, the energy they consume is primarily devoted to their intended purpose: lighting, not heating.
XED or Xenon Energy Saving Discharge Lamps are superior to the most popular LED or Light Emitting Diodes in many ways. XED lights are better in terms of spectral contents, power consumption as well as total running life hours. They produce less glares and are clearer under foggy weather.
Among the visible light spectrum, blue wavelengths have the most powerful effect on your sleep-wake internal body clock. Both natural and artificial blue light can boost your alertness and mental sharpness. But too much of it may keep you awake when your body needs to wind down.
Do blue lights use more energy?
Blue light is very energy intensive, and red, yellow and green light operate at lower energy levels. For a long time, those colors were feasible to produce at scale, but blue LEDs were stubborn holdouts.
Visible light may look white, but it's actually a range of colors. Each color has a different wavelength. Blue light is made of short wavelengths with a lot of energy. Sunlight is the main source of it, but blue light also comes from some light bulbs and electronic devices.
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).
As you might expect, darker colors require less energy to illuminate, with black being the lowest energy color and white being the most energy intensive. What you might not expect is that blue pixels use approximately 25% more energy than red and green pixels. However, not every display is an OLED display.
The best night light colors for sleep are red and amber, as they are warm and soothing colors that promote a good night's sleep. It's thought that colors close to red on the light spectrum stimulate melatonin production. Red light has a lower color temperature than regular sunlight, making it ideal for sleep.
Constant exposure to blue light over time could damage retinal cells and cause vision problems such as age-related macular degeneration. It can also contribute to cataracts, eye cancer and growths on the clear covering over the white part of the eye.
When you stare at a screen for hours at a time, whether it is a computer, TV, phone or tablet, you are exposed to blue light from the device. Alarmist headlines claim blue light from too much screen time is blinding us. But there is no scientific evidence that blue light from digital devices causes damage to your eye.
Blue light fools the brain into thinking it's daytime. When that happens, the body stops releasing a sleep hormone called melatonin. Melatonin is nature's way of helping us wind down and prepare for bed. The body starts releasing it a couple of hours before bedtime.
No one was able to grow gallium nitride crystals of high enough quality, since it was seen as a hopeless endeavour to try to produce a fitting surface to grow the gallium nitride crystal on. Moreover, it was virtually impossible to create p-type layers in this material.
Overuse won't cause burning or damage to the skin, but it won't fast-track your results, either. Generally, LED light therapy works best when used at least three to five times a week over a four to five week period. Each device will vary, so be sure to follow the instructions closely for best results.
What is benefit of blue lighting?
Blue light is needed for good health: It boosts alertness, helps memory and cognitive function and elevates mood. It regulates circadian rhythm – the body's natural wake and sleep cycle. Exposure to blue light during daytime hours helps maintain a healthful circadian rhythm.
LEDs, however, do not contain a filament and instead illuminate using a semiconductor. So instead of just instantly burning out like traditional bulbs, LED lights age over time and progressively get dimmer until they stop working altogether. This is what we call “lumen degradation” or “LED degradation”.
LED (Light Emitting Diode) bulbs are the most energy efficient lighting option available, and can therefore save you the most money on your electricity bills. They produce 40-80 lumens per watt, and offer several other benefits, including longevity and brightness.
Photopic luminous efficacy of radiation has a maximum possible value of 683.002 lm/W, for the case of monochromatic light at a wavelength of 555 nm (green).
Do LEDs save energy? LEDs use much less energy than incandescent bulbs because diode light is much more efficient, power-wise, than filament light. LED bulbs use more than 75% less energy than incandescent lighting. At low power levels, the difference is even larger.
But when you raise the current up to the level it takes to light a room, nitride-based LEDs stop producing photons at the same rate. According to the research from UCSB's Center for Energy Efficient Materials, it's because the electrons collide with each other and lose their energy through heat instead of light.
LEDs typically have efficiency values between 30% and 50%. This means that for a typical LED with 40% efficiency, given every 100 watts of electrical input, only 40 watts worth of energy is released as useful light energy (i.e. illumination), and the remaining 60 watts are released as heat.
Even the best LED light bulbs will lightly warm up because of the internal components that create the light. The base of the LED bulb acts as a heat sink and allows the surface of the bulb to maintain a safe temperature. However, if these components are not adequately ventilated, it will produce more heat output.
That's because LEDs are designed to be as efficient as possible without compromising the quality of the light -- and some LEDs are better at the job than others. For example, an LED bulb with comparable brightness to a 60-watt incandescent will typically only draw 8 to 12 watts.
Does TV emit blue light? In short, yes. LED screens that are popular these days emit a great deal of blue light, which can be potentially harmful to the eyes. Therefore, watching too much TV, especially late at night, can suppress melatonin production that makes us ready for sleep.
Does blue light affect skin?
Blue light is also known to penetrate the skin deeper, damaging essential proteins and resulting in wrinkles and loss of firmness. “Blue light contributes to premature aging, pigmentation, eye damage, cataracts, cell shrinkage, wrinkles and photo damage,” adds Dr.
It's well-documented that exposure to blue light can negatively impact your sleep quality. Electronic screens, LED lights, and fluorescent lights can all contain blue light. One small older study from 1991 and one 2016 study on mice found evidence that green light could also negatively impact melatonin levels.
It's safe to say most of us spend a lot of time staring at screens. And that can be bad for our eyes. Blue light from electronics is linked to problems like blurry vision, eyestrain, dry eye, macular degeneration, and cataracts. Some people have sleep issues.
Sources of blue light
Some modern lighting sources, such as LEDs and CFLs (compact fluorescent lamps), can produce relatively high levels of blue light. Computer and phone screens can also produce blue light.
Some of the ways that this invention has impacted everyday life include: Energy efficiency: One of the primary benefits of blue LEDs is that they are highly energy efficient. They use less energy than traditional incandescent bulbs and can last for many years, which can help to reduce energy consumption and costs.
Although most types of LED lighting do not emit any UV light, brilliant blues do emit a small amount. However, the phosphor reduces this to such a small fraction of the already small amount, the amount emitted is essentially negligible.
Wavelength of blue light
Blue light has very short, high energy waves. In fact, they're only slightly longer and less powerful than UV waves, which are too short for people to see with the naked eye. Health experts have warned against the harmful effects of UV rays, which can damage your skin and your eyes.
Do LED lights emit blue light? Yes—but no more blue light (pdf) than other lightbulbs, provided they give off the same balance of shorter and longer light wavelengths. “Warmer” light has more of a yellow tone to it, while “cooler” light, which is similar to daylight, appears a little bluer.
The best night light colours for sleep are red and amber, as they are warm and soothing colour that promote a good night's sleep. It's thought that colours close to red on the light spectrum stimulate melatonin production. Red light has a lower colour temperature than regular sunlight, making it ideal for sleep.
Yellow light, has been proven effective in protecting the retinas of patients exposed to excessive blue light, since it offers the best contrast.
What is the range of blue light?
Visible light and blue light
Blue light generally is defined as visible light ranging from 380 to 500 nm. Blue light sometimes is further broken down into higher energy blue-violet light (roughly 380 to 450 nm) and lower energy blue-turquoise light (roughly 450 to 500 nm).
LED lights are much more efficient than other lighting options, like CFLs and incandescent bulbs. According to energy.gov, the average household saves about $225 in energy costs per year by using LED lighting.
- Blue. A 2017 study reported in the scientific journal PLOS ONE (3) found that blue lighting leads to post-stress relaxation three times as quickly as conventional white lighting. ...
- Red. Red light has also shown the potential to calm people. ...
- Pink. ...
- Green.
Choose a bulb with a color temperature of 2700K or lower, preferably 2400K. These bulbs are usually labelled "warm white" but confirming the exact color temperature can be preferable.
What color LED lights do not attract bugs? Bugs can see Ultraviolet (UV), blue and green. That is why they are attracted to white or bluish lights such as mercury vapor, white incandescent, and white fluorescent. On the other hand, yellowish, pinkish, or orange are the least attractive to the bugs.
Research studies discovered red to be the best color light to help you sleep, because it increases production of melatonin as well as full darkness. On the other end of the spectrum, blue is the worst.
One study by Travelodge found that households that have blue bedrooms received the best night's sleep compared to any other color. Having blue in your room can make you feel safe, relaxed, and calm. As a result, it's one of the best bedroom colors for sleep.
Typically, the forward voltage of an LED is between 1.8 and 3.3 volts. It varies by the color of the LED. A red LED typically drops around 1.7 to 2.0 volts, but since both voltage drop and light frequency increase with band gap, a blue LED may drop around 3 to 3.3 volts.
Our eyes can easily focus on fine details in red or green light. But our retinas can't handle blue light very well. Blue light scatters more widely within the eye and tends to be focused in front of the retina, making it appear slightly out of focus. What we notice is a kind of halo around bright blue lights.
Exposure to blue light before bedtime also can disrupt sleep patterns as it affects when our bodies create melatonin. Interruption of the circadian system plays a role in the development of type 2 diabetes, cardiovascular disease, cancer, sleep disorders, and cognitive dysfunctions.
How much current can a blue LED handle?
VL = LED voltage (2V, or 4V for blue and white LEDs). The LED current must be less than the maximum permitted for your LED. For standard 5mm diameter LEDs the maximum current is usually 20mA, so 10mA or 15mA are suitable values for many circuits.
Three scientists have jointly earned the Nobel Prize in physics for their work on blue LEDs, or light-emitting diodes. Why blue in particular? Well, blue was the last — and most difficult — advance required to create white LED light.
Nature white 4000–4500K or daylight white 6000–6500K is the best LED light color for studying. You can focus on your task easier under a white color lamp. Though your eyes may feel comfortable with warm yellow light, you will be sleepy during studying.
