Lumistrips LED Lighting Blog

Nichia Optisolis LEDs light art museums across Germany

The innovative Optisolis LEDs from Nichia natural spectrum LEDs that emit light which closely matches the spectrum of natural sunlight.

The extraordinary result is achieved by using a revolutionary new phosphor technology and special blue LED chip. The spectrum of the 420nm blue chip contains almost no UV emissions and in combination with the phosphor achieves a CRI value of 98+, an ultrahigh number considering sunlight has CRI 100.

The high quality of light from Nichia Optisolis LEDs renders colors accurately and adds the benefit of increased awareness of contrast and texture. In combination with their very low UV emissions, Optisolis light fixtures are particularly suitable for use in museums and art galleries where the highest possible CRI value is preferred without damaging the valuable works of art with UV rays.

The first to implement Nichia Optisolis lighting are museums in Germany: Zeppelin Museum in Friedrichshafen, the Ludwig Museum in Koblenz and the Picasso Museum in Münster.

Zeppelin Museum Friedrichshafen: LED lighting (left) and Optisolis LEDs by Nichia / Lumitronix (right)

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Seoul Semiconductor SunLike Natural Spectrum LEDs reveal color and depth of artistic works

The new SunLike LEDs from Seoul Semiconductor are the world’s first natural spectrum LEDs, as they produce light that closely matches the spectrum of natural sunlight. This is made possible by using a the TRI-R technology new LED architecture, with a purple emitter in combination with a red, green, and blue (RGB) phosphor mix, unlike conventional white LED that use a blue emitter and yellow phosphor. 

Spectra comparison Sunlike LEDs, sunlight, ordinary LEDs, fluorescent light

This new design makes possible for an LED to render colors very accurately, almost as sunlight, with the added benefits of increased awareness of contrast and texture.

Sunlike LEDs will make art have the same colors and contrast as under sunlight

The high quality of the SunLike LEDs light spectrum is expressed both by the traditional color rendering index (CRI) and the new Color Fidelity Index. Therefore, SunLike LEDs have CRI 97+ and  Rf 96(TM30 Fidelity Index), values that indicate the high accuracy of reproducing the original color from 99 representative color indexes.

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Innovative LED technology: SunLike Natural Spectrum LEDs by Seoul Semiconductor

SunLike LED techology from Seoul Semiconductor and Toshiba

The innovative SunLike LEDs from Seoul Semiconductor are the first natural spectrum LEDs on the global market. For the first time an LED can emit light that closely matches the spectrum of natural sunlight.

SunLike LED package design

The special ability to have a spectrum close to sunlight comes from using a new LED design, with a purple emitter in combination with a red, green, and blue (RGB) phosphor mix, unlike conventional white LED that use a blue emitter and yellow phosphor.  By removing the blue LED chip and replacing it with a purple light one, lighting technology is fundamentally transformed. For the first time it is possible to render colors accurately with very low energy use and positive effects on health. Compared with other LED lights, the new SunLike Series do not have a blue energy peak associated with eye discomfort and poor sleep patterns.

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Casambi light control and Seoul Semiconductor SunLike LEDs for true human-centric lighting

SunLike Human Centric lighting via Casambi app

Casambi, a pioneer in Bluetooth Low Energy (BLE) wireless lighting control, has teamed up with LED technology specialist Seoul Semiconductor to offer lighting designers precise control of LED strips, modules and luminaires that use the new SunLike technology that matches the spectrum of sunlight. For the first time, this development puts true human-centered lighting in the hands of designers.

Users can use Casambi's Bluetooth-based wireless control system and app with products that include SunLike series LEDs to precisely adjust the light level, knowing that the spectrum reflects real sunlight, a key ingredient for Human-centric lighting

Human-centric lighting describes lighting designed to work with the natural rhythms of the human body. It is based on the well-known fact that the human eye recognizes the presence of a certain wavelength of blue light in the spectrum of sunlight and derives the time of day from this. In this way, light helps to regulate our sleep-wake cycles and other physical rhythms and has a significant impact on our mood and well-being.

Human-centered lighting takes advantage of this effect by adjusting its brightness and color temperature during the day to mimic natural light.

With Casambi you can now set the color temperature at specific hours of the dayCasambi allows control of the lights through a timer or a variety of presence/movement sensors and daylight sensors. It can control lights that change colour temperature over a very wide range, and designers have the freedom to configure dimming and create scenes or animations for the application.

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Home lighting guide with LED strips and luminaires

Home lighting with LEDRISE Lumistrips in covelights

Good design of your home lighting will ensure that the right amount of light can be switched on conveniently and will light where and when it is needed. A proper home lighting should avoid over-lit areas and give control and flexibility to create lighting effects for different situations. Well-designed lighting will be inherently easier to use and more likely be energy-efficient.

The recommended approach to home lighting is to use three lighting levels or layers: general lighting, task lighting and accent lighting. By combining these three levels, the recommended lighting level for each room or activity can be obtained, as below: 

Recommended lighting levels for the Home  in Lux
Living rooms general 50-150
Casual reading 150
Study 150-750
Bedroom general 50-150
Kitchen general 150
Kitchen working areas 400
Bathrooms 150-300
Halls and landings 100-150
Stairs 100-150
Dining rooms 150-450

The three levels of lighting

General lighting should ensure a sufficient minimum level of light in the room. There are many LED light sources that can be used for this purpose: LED modules, strips, luminaries or spotlights. Decide on the desired illuminance level (lux). In living rooms and bedrooms give a certain degree of flexibility (through control settings/dimmers) so...

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LED Lifetime, Lumen Maintenance: Explained

LED is the only light source that looses a significant amount of its initial brightness overtime, before it fails completely. This particularity can lead to a confusion in what LED lifetime means. 

For all reputable lighting manufacturers and sellers, LED lifetime is equal with L70 lifetime which is the time it takes the LED to reach 70% of the initial brightness. At this point the LED is considered end-of-life and has to be replaced.

1.How to measure LED lifetime?

With LEDs such as the Nichia 757 series having more than 60.000 hours L70 lifetime it begs the question of who tests an LED for such a long time? One year has 8760 hours, so a 60.000 hours test will last more than 6 years!

To solve this problem the industry has created the IES LM80-80-2008 measuring standard and the IES TM21-2011 Projecting Long Term Lumen Maintenance of LED Light Sources.

2.IES LM80

IES LM80 or “Measuring Lumen Maintenance of LED Light Sources” is the industry standard method for testing LEDs to determine lumen depreciation over time. It is carried out over a 6000 to 10,000 hour period, with luminous flux measured at 1000 hour intervals of multiple LEDs of the same type, running at different currents and operating temperatures. 

The LM80 test is a Department of Energy (DOE) approved method for measuring lumen depreciation of solid state (LED) light sources, arrays, and modules. The Illumination Engineering Society (IES) and DOE Solid State Lighting Standards Development group worked together to create the LM80 test criteria.

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Mid Power LEDs it test: Nichia 757G is the leader

As a manufacturer, we aim to use the top performing LEDs in our LED strips and modules. We are particularly focused on mid power LEDs, those that usually use less than 0.3 Watt of energy, are fairly small and require minimal or no cooling. A big share of our products use these LEDs.

Before choosing the best performing LED for our products we have compared more than a dozen models from the top LED manufacturers: Nichia, Osram Opto Semiconductors, Samsung, Philips Lumileds, LG Innotek, Seoul Semiconductor, Cree, Everlight.

For a meaningful comparison we selected LEDs that function at 65 mA with a voltage between 2.75 and 3.2 V, classified in three groups:

  • Cold White (5000-6500K), CRI 80+, for linear fluorescent replacements (LED tubes) or lighting fixtures for the office or industry
  • Warm White (2700K-3900K), CRI 80+, usually used in LED lamps, linear lighting fixtures, cove lights, desk lamps, usually for residential and hospitality sectors
  • Warm White (2700K-3900K), CRI 90+, with applications in luxury lighting, professional linear lighting fixtures, cove lights for commercial and hospitality sectors

For each category we compare the luminous flux and luminous efficacy at the usual junction "lab temperature" of 25ºC and at a more realistic 100ºC. The comparison data is that from the manufacturers datasheet.

We also added the performance data of average 5050 and 3528 LED packages because such LEDs are still used by many lighting manufacturers today, with applications including linear led modules, fluorescent tubes, lamps, panels or even luxury lighting fixtures.

Cold White (5000-6500K), CRI 80+, for LED strips and modules for the office or industry.

Nichia 757G LEDs have the highest performance and efficacy at 25ºC and 100ºC, with 37.5 lumen and 210 lumen / watt and 33.75 lm and 189 lumen / watt respectively. They also have the lowest performance difference between "lab" and "reality" operating temperatures, at only 10%.

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Human Centric Lighting: Explained

Human Centric Lighting is lighting specifically designed to produce a beneficial physiological and/or psychological effect upon humans. It consists of adapting the light colour and intensity during the course of the day via tunable white LED lighting solutions.

Human Centric Lighting (HCL) supports human health, well-being and performance by considering and then properly planning the implementation of a light system according to the desired visual, emotional and especially biological effects of light. The main focus of Human Centric Lighting is on people's needs for their living, leisure and working environment. The study is based on the characteristics and effects of natural light, a dynamic source with changing tone and brightness, as a day goes by and seasons change. 

To implement an adequate Human Centric Lighting a combination of white LED light sources is used, usually warm white (2700K) and cold white (6500K). This solution is also called Tunable White lighting. By adjusting the intensity of each, bright or dim white light with a hue between 2700K and 6500K can be obtained. It is a new way to use and implement artificial light, in accordance with changes in natural light and research about effects on people.

More light, more productivity

Increased lighting intensity will empower people to work in a more concentrated way, tire less quickly, make fewer errors, and detect errors more precisely. And what makes life more pleasant for the individual, is more lucrative overall for the company.

More concentration and creativity

Human Centric Lighting coordinates the interplay of light, atmosphere and space to match the well-being of people in their environment. It is particularly important for modern office environments because it focuses on people.

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LED heat management: Explained

Getting the most from a product based on LED technology can be tricky because of one important factor: how operating temperature can result in a substantial difference between the advertised and actual performance of a LED based product.

Important factors in this effect are the LED quality, product design and heat management: how much of the heat generated while in operation is channeled away.

If the heat is well managed, a LED based lighting product will have performance as advertised, long life and will be energy efficient. 

The basics of LED heat management

LEDs use electricity and this process generates heat. This heat needs to be channeled away from the LED in the ambient as efficient as possible. Designing the LED itself and the luminaire for this purpose is called heat management. The heat that needs to be channeled away is directly proportional with the luminous flux and power consumption of the LED.

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The new TM-30 Color Fidelity Index: Explained

The Fidelity Index is used to measure the similarity of the light source to a reference source, exactly as described in the CRI method. The TM-30-15 scale is between 0 and 100 and uses 99 color evaluation patterns. Using 99 color samples versus only eight color samples provides a statistically more representative and reliable metric that shows how accurately colors are represented. The 99 colors in the TM-30-15 Fidelity Index were selected from real objects.

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