Safe, functional, natural and efficient. The white light creates an atmosphere of well-being in the city and provides security in the streets. The white LEDs are so successful for your high luminous efficacy, luminous intensity of good to excellent and high energy efficiency. As a setter of trends in the lighting industry, OSRAM plays a very important role in the development of efficient, long-lasting LEDs.
White Light in the City
During the course of evolution, the human eye has been adjusted to the bright, white light from the Sun is not, therefore, surprising that the artificial white light is regarded as a particularly natural light. Despite this, sodium vapor lamps of high pressure were the preferred solution in street lighting for many years. Compared with mercury vapor lamps of high pressure that have been previously used, sodium vapor lamps of high pressure have higher luminous efficiency and last longer. His typically yellowish light, however, makes it difficult to distinguish colors at night and gives the objects and buildings an unnatural effect. This is one of the reasons why the municipalities and the lighting designers increasingly insist on white street lighting. More and more, the choice has been the LED.
Potential Savings of LED Street Lighting
In the future, up to 80% energy saving will be possible by switching to LED streetlight, compared with mercury vapor lamps of high pressure previously in use. Even in changing light fixtures, installed with sodium vapor lamps of high pressure, for the LEDs, substantial savings are possible.
The White Light Increases Safety
The white LED light contributes a lot with security in the cities. The luminous efficiency, ranging from good to excellent, and the glow subjectively better white light contribute to the fact that the objects, people and buildings are more easily recognized. Thus, the number of traffic accidents, for example, can be notably reduced. Investigations have shown that automobile drivers detect people on the side of the road early and with a greater distance when there’s a streetlight with white light. Pedestrians, too, recognize the obstacles more quickly than under the yellowish light of globes of high-pressure sodium vapour, often used in street lamps.
Following yet another important benefit of white LED light: A decrease in the crime rate in cities is being achieved through the use of the sources of white light. Under this type of lighting, it becomes easier to recognize people, it becomes easier to detect potential crimes and attacks by third parties are easier to be reported. White light also improves the image quality of video security systems and, therefore, support investigations by the authorities.
The Advantages of White LED
White is not always white. This is due to the fact that, as often occurs in daylight, the various color temperatures ranging from cold white to warm white are produced by artificial light. In the public squares and in pedestrian malls, the white hot light produces a comfortable atmosphere of well-being with color temperatures around 3,000 Kelvins. On the other hand, the neutral white light promotes safety on the streets. As a result of a carefully chosen color temperature, some materials appear most prominent in architecture. For glass and steel, for example, a cold light is chosen, while the facades of brick look more natural in warm white light.
- News and knowledge: basic knowledge of LED you may check with growtheology.com
Natural Lighting Effects
In street lighting, for what we perceive as white light brighter than the artificially produced yellow light? During the course of evolution, the human eye has been adjusted to the natural white light. In the eye, there are two types of sensory cells that are activated for sensory perception in different intensities, depending on the brightness level.
According to the popular saying, “all cats are grey in the dark” [it is impossible to see details in the dark]. At low levels of brightness, only the sensory cells that do not perceive color are activated within the eye but, in return, they react more sensitive to blue light. The Hawthorn blue, for example, still emits a bright blue even under a strong Moonlight, while the poppy looks like a red bland. These sensory cells, therefore, react less sensitively to the yellow light and red light. A low level of brightness then yields the fact that white light (a major component of blue) is perceived as brighter street lighting-the yellow light with a smaller component of blue, or without any blue, in the case of sodium vapor lamps. The fixtures that are equipped with white LEDs are then perceived as brighter than the light fixtures with sodium vapor lamps, even if the volume of the light emitted is identical.
Strictly speaking, most of the exterior lighting calculations now are evaluated incorrectly, since the sensitivity of the human eye, adapted to the brightness, is considered as a starting point. The brightness levels in street lighting generally correspond more to the vision of twilight.
Many system operators already take this contact in your planning and are changing from yellow to white light. This can reduce the brightness level and so, the energy consumed, without the citizens notice any difference. Finally, not only the energy and costs are saved this way, but there is also an increase in the safety and quality of light emitted by lighting systems, as has been proven by several studies in recent years.
Some countries such as the United Kingdom, for example, have changed even their local rules using this effect to save money, protect the environment and make their cities more habitable (compare British standard BS5489-1 + A2).
White LED Lamps From OSRAM
In the research lab of OSRAM, the white LED light has had an important role for many years. LED designs stand out so successful for your hot white light, relaxing with peak values in Planck’s curve.
- Press release by OSRAM: Lab: red LED breaks the barrier of 200 km/W
- Press release by OSRAM: the concept of “Brilliant-Mix” for warm white light to sense of well-being
- Press release by OSRAM: OSRAM Lab: record efficiency for hot light
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