illuminate |24 July, 202021 May, 2019 |Technical RecommendationsWith information from SignifyIt is a fact that the quality of light is a key differentiator in lighting and for several years now, LED technology has offered a wide range of possibilities to differentiate the quality of spatial, spectral and temporal light.This forces us to review the traditional way of evaluating the quality of light.Signify continually optimizes its products by bringing together a deep understanding of user needs, knowledge of lighting applications, and scientific insights.Signify has created the EyeComfort brand based on the criteria of flicker, strobe, photobiological safety, glare, dimming, adjustability, color rendering and audible noise.In this sense, its product range of LED lamps and luminaires is evaluated by means of these criteria.In this report carried out by Signify, the criteria on which EyeComfort is based are described in order to offer lighting with high standards for visual health care:Both are temporary light "artifacts" (TLAs).TLAs are defined as changes in visual perception, induced by a light stimulus, luminance, or spectral distribution, that fluctuate over time for a human observer in a specified environment.Fluctuations can come from a number of sources including: disturbances in the power grid interactions with controls (eg regulators) disturbance in the input signal from external sources (eg microwaves ) and fluctuations designed from the electronic driver.Methods are known to suppress fluctuations in LED light output while reducing the visibility of unwanted TLAs.These methods, however, require a compromise with cost and efficiency and require more physical space;In addition, they reduce the life of LED products with any architecture.Until recently, various measurements, such as Flicker Index (FI) and modulation depth, were used to assess the visibility of flicker and strobing.Neither of these measurements is adequate to predict what people actually perceive or experience.Flicker and strobe visibility is affected by modulation depth, frequency, waveform, and duty cycle, and these measurements do not take all of these parameters into account.Therefore, scientific models have been developed based on the human visual system, referring to the visual perception of humans, which is the part of the nervous system that allows us to see.A more robust TLA measure for flicker is PstLM, and for strobe, SVM.These measurements are supported by Lighting Europe and NEMA and are used in the evaluation of Signify's EyeComfort LED lighting.Continuing improvements in ALT measurements are currently being investigated.Why should we care about flickering and strobing?Lighting products exhibiting these effects are considered to be low quality lighting.TLAs are not only annoying to people, they also have an impact on eye comfort, overall comfort, and visual performance.Specifically, visible ALTs can reduce performance on a visual task, cause ocular discomfort (tired eyes), increase the occurrence of headache, eye fatigue, and cause discomfort.Studies show that visible blinking can trigger epileptic seizures in certain cases.With this in mind, Signify's EyeComfort LED products have been designed to minimize visible flickering and strobing.The risk of blue light is a photochemical damage to the retina and depends on the spectral composition, intensity and time of exposure to the eye.The International Electrotechnical Commission (IEC) has developed a standard for evaluating photobiological safety.The sources are classified into 4 risk groups (0 = no risk, 3 = high risk).A common misunderstanding in the media is the idea that LED lighting contains higher proportions of blue wavelengths and is therefore more likely to cause blue light hazard.The Global Lighting Association has thoroughly researched and measured this, comparing the spectral content of different lighting technologies to the standard mentioned above, along with input from many scientists.LED-based light sources for consumer use do not contain any energy in the ultraviolet (UV) part of the spectrum and are therefore not harmful to people with increased sensitivity to UV light.Unlike incandescent and halogen light, LED hardly emits any infrared (IR) light.LED light sources for the consumer there is no risk, because the IR radiation does not have enough power.All EyeComfort LED products are classified in risk group 0 or 1 (RG0 / RG1).This means that the use of these products does not represent a photobiological risk under the limitations of normal behavior or that the lamp does not represent a photobiological risk.Glare is one of the most significant factors of dissatisfaction.It can be divided into disturbing glare and annoying glare.Disruptive glare refers to the reduction in visual performance caused by a glare source in the field of view.Discomfort glare is defined as the feeling of discomfort caused by bright light sources.The feeling of discomfort depends on many parameters, such as the luminance of the source, the area of ​​the source and the position of the source in the field of view, the background light conditions, the type of activity and the duration of the exposure to a bright fountain.For years, researchers have tried to quantify the degree of visual discomfort.Glare assessment for indoor workplaces is generally done by UGR measurement (Unified Glare Rating).This measurement is based on average luminance levels calculated from a far field intensity distribution.Pixelated or non-uniform output windows with luminance contrasts are often seen in LED lighting solutions.Studies have shown that pixellated exit windows that have the same average luminance as uniform exit windows (and thus the same UGR value) cause more nuisance glare.This means that the current UGR is not always appropriate for use with non-uniform output windows.Investigating the applicability or improvement of the current UGR and exploring alternative ways to predict nuisance glare is an important research topic.Improvements to the current UGR are mainly directed at a correction of the position index in the UGR formula to take into account the angle of view dependence, the correction of the average luminance, a correction of the observed luminous surface and the general correction to the add an additional intersection to express the luminance contrast within the glare source.Suggestions for alternative glare description methods are based on retinal receptive field modeling of the human visual system (HVS) and the application of this model on room luminance maps to assess glare. annoying glare.The latter approach is identical to the TLA measurements which are also based on modeling of the human visual system.Anti-glare measurements should address things like reducing luminance, reducing contrast, or reducing font size.In Signify's range of LED lighting products, lamps with and without glare control are distinguished.A lamp with glare control contains diffusion materials or pixelated lace on top of the lamp and is perceived as having less glare compared to lamps without any glare control at the same flux and background adaptation.A suitable glare measurement for lamps is not currently available and is a subject of future research.The dimming function of LED products is defined as the ability to change the light intensity according to your own preference.The dimming function of LED products allows you to create the perfect ambience or directed lighting in any environment.People want to regulate artificial lighting for various reasons.First, they want the ability to change the mood of the environment (dim and inviting, bright and energizing).Second, the dimming function can provide different levels of flow during the day, based on different activities or based on outside light levels.Poor implementation of the dimming function can lead to discomfort or unwanted effects, such as visible flickering at deep dimming levels, unstable transitions, high minimum light levels.These problems originate from the LED driver circuit, mains voltage amplitude variations, mains connected loads, and regulator interaction.Smart electronics design solves the deep dimming problem that suppresses repetitive or irregular visible variations in light level.Dimmable products from the EyeComfort LED range provide gradual dimming at presets (SceneSwitch) or continuously over the full intensity range.Adjustable LED lighting can be defined in three categories:– Warm Dimming: Ability to mimic incandescent behavior (i.e. Correlated Color Temperature [CCT] drops from 2700K to 2200K while dimming) - Tunable White: Ability to change the white hue of a light (e.g. 2700K to 6500K) - Adjustable Color: Ability to change the color of the lighting (RGB)People appreciate warm settings at low light levels to create nice and cozy environments [45], but this can vary by region.Some Signify EyeComfort LEDs provide the WarmGlow dimming function.By combining two different LEDs (2200K and 2700K), an incandescent dimming behavior can be mimicked.The WarmGlow feature comes in two variations.SceneSwitch with fixed setting and WarmGlow soft dimming throughout the range (2700K to 2200K).Along with the effect of environment, the regulation function combined with a change of CCT also has advantages with respect to the circadian rhythm of people.Our biological clock tells us when to wake up and when to go to sleep.The intensity and action spectrum of light are one of the parameters that control these responses.High-intensity light that contains a lot of blue makes us feel awake and alert, while low-intensity light with little blue triggers the release of melatonin, a sleep hormone.Research has shown that bright lighting with a strong blue component is recommended in the morning to help wake you up and should be avoided at night, because it suppresses melatonin production and makes it harder for you to fall asleep.Warm and regulated CCT environments at night are ideal for achieving an undisturbed biological rhythm.EyeComfort LEDs with WarmGlow dimming function support the ambience function and support people's circadian rhythm.Color quality relates to the preference and appreciation of users' perception of a given application.The color quality of white light sources has an impact on space, objects, and human appearance.Poor color quality can reduce visual discrimination and the proper reproduction of illuminated people, spaces, or objects.For example, human skin tones, plants, and food can appear dull or undersaturated under lighting with low color rendering or low color saturation.Color rendering of a white light source is defined as the effect of an illuminant on the color appearance of objects, consciously or unconsciously compared to their color appearance under a reference illuminant.The general Color Rendering Index (CRI-Ra) is used to measure and specify the color rendering capability of a white light source, based on a set of eight Test Color Samples (TCS). ) specific, moderately saturated, approved by the CIE in 1974. An IRC of 100 means that the color rendering under the test source is equal compared to the color rendering under the reference source (reference is incandescent for CCT < 5000 K ).User preference is not always directly related to the highest IRC value.Color saturation (vividness), especially red saturation, also plays an important role in preference [48,49,50].In general, people like some oversaturation because objects look more colorful.Preference for skin tone appearance is different, also between cultures.Finding the right balance between color fidelity and color saturation for a specific application is important.The goal of the EyeComfort LED light is to improve color differentiation and aesthetics through the use of LEDs with good color quality properties.LEDs can suffer from audible noise, specifically when used at deep dimming levels.The voltages and currents that are produced can create a mechanical resonance in the components.This noise can be perceived as uncomfortable and annoying.This is why Energy Star has to implement requirements for audible noise levels.According to Energy Star requirements for audible noise, lamps must not emit noise above 24 dBA at one meter distance.This threshold is not strict enough for lamps in a completely silent living room (approximately 20 dBA) or lamps placed close to people (reading light, bedside lamp).All Signify EyeComfort LED products take into account published regulations.Hello, I would like to know what harmful effects the compound of a class c uv germicidal fluorescent tube has, thank you from Puerto Montt.How about Alex.It is important to note that in the same way that UV-C can inactivate bacteria and viruses, it can also be harmful to human cells, since our cells also contain DNA.This exposure can cause skin irritation, corneal damage, and cell mutations that lead to cancer.Exposure to UV-C radiation is regulated globally, with common agreement on human health risk and safe exposure levels.These regulations and standards set limits on allowable daily exposure.UV-C devices should always be used in accordance with the manufacturer's instructions to ensure safe operation and within appropriate enclosures where light leakage has been controlled and risks have been adequately managed.Here you will find information that will be of interest to you https://www.iluminet.com/luz-ultravioleta-para-eliminar-virus/Enter your email to subscribe and receive notifications when we post something.Email address