Frequently asked questions
LED: 3 letters for 1 solution
With such ambitious goals, Toshiba Lighting had to find means to produce much better light bulbs than incandescent and halogen lamps. This aim combined with economic and environmental issues: we blazed our path to the solution. In the 70’s, an LED was used as a coloured indicator or warning lights. In 1996, we obtained white light LEDs. Today LEDs light large areas like museums, public places and parks to houses. We began developing LEDs in the very early stages of the technology as we saw its potential for vast energy savings and long life. It was a gamble that we are now seeing a return on many years later. A true sign of our commitment to this innovative technology.
LED – How it works?
An LED is an electronic component, more precisely an electroluminescent diode(LED is the acronym for Light Emitting Diode), which converts electric energy into light. The technology was developed during the 1950s and was used mainly for red and green warning lights. White light was developed during the 1990s and was obtained by mixing with a third colour, blue. With new manufacturing methods it became possible to produce higher efficiency, allowing the development of lighting that has the potential of replacing any existing technology. The basic light creation process is a recombination between electrons and holes in a semiconductor material. LED technology has taken over the world of lighting as the most innovative invention since the incandescent lamp invented by Edison, and is today the most direct way to create light.
Advantages of LED
From the beginning, E-CORE LED Lighting was praised by a large public composed of retailers, professionals, architects and end users, as its 73% growth over last year shows.
Last year, hundreds of thousands of professionals and customers from the whole world chose our LEDs. How can we explain such a success? Let’s ask them!
» Our LEDs last up to 60,000 hours without any maintenance.
» Our LEDs use up to 80% less energy than incandescent lamps.
» Our LEDs withstand shock and vibration.
» Our LEDs generate minimum ultraviolet and infra red.
» Our LEDs can reduce CO2 emissions by 80% compared to incandescent lamps.
» Generate less heat thereby contributing towards lower air-conditioning costs.
» A very wide range with many sizes and colours offering new creative opportunities.
LED bulb light up instantly and there are no consequences of frequent on and off switching. Different to other types of light bulbs, LED bulbs are not fragile and are not sensitive to moisture and heat. They also have no UV radiation, the thermal radiation is reduced, thus reducing the expenses of air conditioning, and maintenance expenses are low due to the reduced need for changing bulbs.
LED are characterized by their excellent service life, because LED is hard to stop working completely, their lives are defined by value L70. Their useful life is considered to be finished when the light flux drops to 70% of its original volume. Then LED grow old quickly. Service life of LED light source is not determined only by the LED, other electrical components and thermal design are also a factor. Therefore operational period varies with each product. The durability of an LED bulb is 50,000 hours, compared with only 1,000 for incandescent bulbs.
LED lamps can be dimmable without sacrificing light quality. This is the main difference between LED and fluorescent lamps with high pressure. Dimming saves more energy.
The lighting fixtures are controlled by digital system DALI (Digital Addressable Lighting Interface). This standard, adopted by all manufacturers, overcomes the disadvantages of the principle 1-10 V and is used more and more, especially in more complex systems. DALI is supported by BMS (control systems for buildings) and LMS (systems for lighting control).
1-10 V dimming
Lighting fixtures can be dimmable in steps via an interface 1-10 V. Standard voltage of 1 V and 10 V is transformed in the light brightness.
Street lighting equipment has graduate dimming. When the second power supply is connected to the lamp, the light output and energy consumption decrease by almost 50%. This provides a very easy way to reduce the amount of light, providing even lower energy consumption at night.
Phase adjustment of LED lamps
Phase control is widely used method of dimming by incandescent lamps as well as halogen lamps. A similar approach is required for LED lamps.
Reducing the luminous flux in LED technology during the life of the system is compensated by increasing the power supply. This achieves a constant and uniform photometric performance, which distinguish Toshiba’s products from the standard LED systems whose luminous flux fell sharply over time.
This is the total light emitted by the light source, which the eye perceives as light.
This is the light output of a light source for solid angle. At the same luminous flux, the more focused light source, the greater the intensity of the light.
This is a unit of measure for illuminating power in relation to an illuminated surface. For multiple visual tasks, minimal illumination is specified and must be considered when planning and selecting a light source.
The color rendering index (Colour Rendering Index – CRI) is a unit of how well a light source can provide color of the objects that are highlighted in terms of color temperature (CCT) of the light source. The higher the index of color rendering, the more natural the colors are transmitted to the site and therefore perceived by the observer. The sun has the highest color rendering index CRI = 100. Most artificial light sources are below this value. Color rendering index is determined by eight standardized color test links.
The color temperature is measured in Kelvin (K) and is a unit of the color effect of the light source. The color temperature is defined as the temperature of the black body, which belongs to a specific color light source.
» Under the 3300 K = warm white, preferred for interior lighting
» 3300 K to 5300 K = neutral white, typical color light for office, industrial or outdoor lighting
» Over 5,300 K = cold white, often used in exterior lighting
At the same luminous flux of 900 lm LED bulb lights have an output of 10W compared to 60W by incandescent bulbs, leading to 83% saving of energy and money. In comparison with fluorescent tube the power in the same light output is 18W, while saving up to 33%.