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In this activity, learners use tonic water to detect ultraviolet (UV) light from the Sun and explore the concept of fluorescence.

Pros: a. Uniform Illumination: LED backlighting provides more uniform lighting across the entire screen, resulting in consistent brightness levels and improved viewing experiences. b. Higher Brightness: Backlighting allows for higher brightness levels, making it suitable for environments with more ambient light. c. Improved Color Accuracy: LED backlighting often incorporates color filters or advanced technologies like local dimming, enhancing color accuracy and delivering vibrant visuals, d. Led sheets have the capacity to uniformly backlight materials beyond traditional lightbox applications for example behind marble to provide beautiful mood lighting in architecture.

Four major hazard classes (I to IV), including two subclasses (IIIa and IIIb), of lasers--ranging from those that pose no known hazard to those that pose serious danger if used improperly. The higher the class, the more powerful the laser is.

Laser stands for Light Amplification by Stimulated Emission of Radiation. A laser is a device that projects a highly concentrated narrow beam of light which is amplified to great brightness using stimulated radiation.

Moreover, LED backlighting often incorporates advanced technologies to improve color accuracy. For instance, some displays employ color filters or quantum dot technology to enhance color reproduction and achieve a broader color gamut. Additionally, localized dimming techniques are employed in high-end displays to dynamically adjust the backlight intensity in specific areas of the screen, resulting in deeper blacks and better contrast.

Our eyes are sensitive to light which lies in a very small region of the electromagnetic spectrum labeled "visible light". This visible light corresponds to a wavelength range of 400 - 700 nanometers (nm) and a color range of violet through red. The human eye is not capable of "seeing" radiation with wavelengths outside the visible spectrum. The visible colors from shortest to longest wavelength are: violet, blue, green, yellow, orange, and red. Ultraviolet radiation has a shorter wavelength than the visible violet light. Infrared radiation has a longer wavelength than visible red light. The white light is a mixture of the colors of the visible spectrum. Black is a total absence of light.

Lasers are used for a variety of purposes including pointing out objects during a presentation, aligning materials at construction sites and in the home, and by doctors for cosmetic and surgical procedures. Many items you encounter on a daily basis use lasers, including CD and DVD players; bar code scanners; dental drills; laser-guided tools, such as levels; and laser pointers

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Another trade-off is the potential impact on contrast ratios. Since the light in LED backlighting is not as localized as in edge lighting, there can be a slight reduction in contrast ratios. However, this difference is often minimal and may not be noticeable to the average viewer.

Another potential drawback is the occurrence of light bleeding. In some cases, light emitted from the edge LEDs may leak or bleed around the edges of the screen. This unintended light diffusion can reduce the overall image quality and result in less defined dark areas, affecting the display’s ability to render deep blacks.

In non-technical terms, the closer the wavelength is to 555nm, the brighter it will appear relative to other colors of the same power. The brightest color is green, followed by red, then blue, then violet.

Pros: a. Slim Design: LED edge lighting allows for ultra-thin displays, making it ideal for modern, sleek designs. b. Enhanced Contrast: This technique provides better contrast levels, as the light can be selectively dimmed or brightened in specific areas, enhancing the overall image quality. c. Energy Efficiency: LED edge-lit displays consume less power compared to traditional backlighting methods, resulting in energy savings.

It is often noted that LED backlighting does have a few drawbacks. One consideration is the slightly bulkier design compared to LED edge lighting. The LEDs and associated components behind the display panel require additional space, leading to slightly thicker devices, as per the image below

Not every laser we buy from our suppliers produces the same output level. The key is the KTP crystal (KTiOPO4). A crystal with good efficiency produces a more powerful beam than a less-efficient crystal using the same current. You can compare this with two gasoline engines, one more efficient than the other. Although they both burn the same amount of gas, the more efficient engine produces more horsepower and is therefore more valuable.

Visible laser or laser system that cannot cause eye damage unless viewed directly for an extended period of time, or with magnifiers, binoculars, or telescopes.

Laser may cause severe eye injury with short duration exposure to the direct or reflected beam. May also cause severe skin damage and present a fire hazard.

Cons: a. Limited Uniformity: Achieving consistent brightness across the entire screen can be challenging, as the light must travel across the panel. This can lead to slight variations in brightness, particularly in larger displays. b. Potential Light Bleeding: In some cases, LED edge lighting may cause light bleeding around the edges of the screen, resulting in reduced image quality and less defined dark areas.

The human eye is far more sensitive to green than red. If you were to view a red and green laser of equal power side by side, the green laser would appear far brighter than the red one.

However, LED edge lighting does have a few limitations. Achieving perfect uniformity of brightness across the entire screen can be challenging. Since the light emitted from the edge-mounted LEDs needs to travel across the entire panel, slight variations in brightness may occur, particularly in larger displays. These variations, although often subtle, can be noticeable in certain viewing conditions.

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Laser that normally does not present a risk of injury if viewed momentarily with an unaided eye, but may present a greater risk if viewed using magnifiers, binoculars, or telescopes.

Our innovative designs in illumination and sound provide unique and memorable settings for events, intimate weddings, and large scale installations.

LED edge lighting also enhances contrast levels in displays. By selectively dimming or brightening the LEDs along the edges, it is possible to control the amount of light emitted at specific regions of the screen. This localized control allows for improved image quality, with deeper blacks and more vibrant colors, resulting in better contrast.

For the compact pen sized laser pointers there is an unlimited duty cycle, however we recommend 100 seconds on and 100 seconds off to optimize diode lifetime. For the larger Spyder III Series the duty cycle is 100% constant on with no harm to the laser module.

LED backlighting is widely used in a range of applications, including televisions, computer monitors, laptops, and digital signage. Its ability to provide uniform illumination, higher brightness levels, and improved color accuracy makes it a popular choice for those seeking high-quality displays with excellent visual performance.

Laser pointers                 Laser light shows Industrial lasers Research lasers

Introduction: In recent years, LED (Light-Emitting Diode) technology has revolutionized the lighting industry, providing energy-efficient and versatile lighting solutions. LED edge lighting and LED backlighting are two popular methods used in various applications, such as televisions, monitors, and signage displays. While both techniques utilize LED technology, they differ in terms of placement and functionality. In this blog post, we will explore the dissimilarities, advantages, and disadvantages of LED edge lighting and LED backlighting to help you make an informed decision.

Manufacturers continue to refine LED backlighting techniques to overcome these limitations. Through advancements in LED efficiency, optical design, and display technology, efforts are being made to improve contrast ratios, reduce power consumption, and minimize the overall thickness of devices employing LED backlighting.

Some lasers emit radiation in the form of light. Others emit radiation that is invisible to the eye, such as ultraviolet or infrared radiation. In general, laser radiation is not in itself harmful, and behaves much like ordinary light in its interaction with the body. Laser radiation should not be confused with radio waves, microwaves, or the ionizing x-rays or radiation from radioactive substances such as radium.

LED edge lighting has found widespread use in various applications, including televisions, computer monitors, and signage displays. Its slim design, improved contrast, and energy efficiency make it a popular choice for those seeking sleek and visually appealing display solutions.

Manufacturers continue to refine LED edge lighting technology to address these limitations. Ongoing advancements in materials, light guide plate designs, and LED placement techniques aim to improve brightness uniformity and minimize light bleeding issues, thereby enhancing the overall performance of LED edge-lit displays.

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We use more efficient KTP crystals in our green lasers. Green lasers also have more components and better laser diodes. Therefore the green lasers cost more than red lasers.

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The technical definition of output power as it relates to laser products is the power level of the laser beam. This is expressed in 'less than milliwatts (

While this may not be a significant concern for most users, it can be a factor in applications that prioritize slim form factors, such as ultra-thin televisions or portable displays.Its for this reason we recommend a newer approach. The flexible led sheet is a new technology which uses the same flexible led strip model used in edge lit products but is expanded in size to become a complete backlight solution and is as little as 1.3mm thick. This provides all the benefits needed for ultra thin displays while providing extremely uniform light coverage on any size display and comes in White, Tunable white and RGBW

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Cons: a. Can be Bulkier Design: LED backlighting requires space behind the display panel, leading to slightly thicker devices compared to edge-lit displays. b. Reduced Contrast: Backlighting can result in slightly lower contrast ratios, as the light is not as localized as in edge-lit displays. c. Higher Power Consumption: LED backlighting typically consumes more power compared to edge lighting due to the need for a larger number of LEDs to illuminate the screen uniformly.

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Ultimately, LED technology continues to evolve, and manufacturers are constantly improving both edge lighting and backlighting techniques, bridging the gaps between the pros and cons of each method. It’s always recommended to review the specifications, read reviews, and compare displays to ensure you find the best fit for your requirements.

Moreover, LED edge-lit displays are known for their energy efficiency. Compared to traditional backlighting methods, such as CCFL (Cold Cathode Fluorescent Lamp), LED edge lighting consumes less power. This efficiency is attributed to the use of LEDs, which are highly energy-efficient light sources, resulting in energy savings and lower operational costs.

Lastly, LED backlighting generally consumes more power compared to LED edge lighting. The need for a larger number of LEDs to uniformly illuminate the screen results in increased power consumption. However, advancements in LED technology and backlighting algorithms have led to improved energy efficiency over time, mitigating this concern to some extent.

The use of the term radiation has occasionally led to a misconception that lasers make things radioactive. Normal applications do not have powerful enough beams to exceed the energy threshold for this. Only a few large research lasers have the ability to potentially make target materials slightly radioactive. The term radiation is used because the beam radiates out from the laser.

Caution: Class IIIb lasers produce sufficient amount of energy to cause personal injury and start fires. Certified laser safety eyewear required when using these products.

Fresnel is a lamp created by Joe Colombo with the intention of appearing to be one of those perfect objects, that cannot be improved any further.

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Conclusion: Both LED edge lighting and LED backlighting have their own set of advantages and disadvantages, and the choice between them depends on the specific application and personal preferences. Edge lighting offers a slim design, enhanced contrast, and energy efficiency, while backlighting provides uniform illumination, higher brightness, and improved color accuracy. Consider the trade-offs and prioritize the factors that matter most to you when selecting a display or lighting solution for your needs.