• The evolution of illumination ——LED lightingYour Place:HOme - Knowledge of LED light
  • Auhtor: LED LIGHT    Time:2/24/2013   Hits:1008
  • There are multiple reasons to choose LED lighting: energy efficiency, long life, fewer maintenance visits (no ballast or starter to replace) and the absence of hazardous material, such as Mercury. But there are a few more reasons to consider LEDs over legacy technology.

    Good Neighbors & Light Pollution
    Light pollution is a general term that encompasses issues of light trespass, glare and urban sky glow. Light trespass is when the effects of a light stray from the intended purpose. Unwelcome stray light entering property or windows from a nearby light source can be very upsetting and is often the reason behind vandalism. Stray light scattered in the atmosphere creates urban sky glow. Urban sky glow has been reported to be increasing around 30% annually in some American cities. Use of a full cut-off lamp, such as the Clearlight EcoSpot reduces and typically eliminates stray light and light trespass. The EcoSpot is truly dark sky friendly.
    Glare is defined by the Illuminating Engineering Society (IES) as the sensation produced by luminance in the visual field that is sufficiently greater than the luminance to which the eye has adapted, thus causing annoyance, discomfort or loss of visual performance and visibility.The discomfort and poor visibility caused by glare can result in driver error. Glare can be reduced, by proper cut off. 




    Light Quality
    With CRIs ranging from 74-78 the Clearlight family exceeds the performance of Mercury Vapor, which has an average CRI of 33, High Pressure Sodium, averages CRI 22 and Metal Halide, averages CRI 68. At night-time, low CRI can impact visual acuity and strain the eye. Studies find that the visibility of a pedestrian in a crosswalk is actually compromised by HPS.
    LED lighting has better vertical illuminance when compared to HPS lighting. Vertical illuminance is essential for viewing vertical objects. The side of a pedestrian seen by an observer is essentially a vertical plane at a right angle to the observer’s point of view. Scene illuminance and especially vertical illuminance significantly influence the quality of a CCTV or TV camera capture. Images obtained by security cameras are clearer and of better quality when LED lighting is used. Not only can LED luminaries such as the Clearlight improve night-time visibility, a pleasing light can promote business and inspire community growth.

    Luminaire Efficacy
    There has been a great deal of discussion about fixture efficacy vs. luminaire efficacy and how to properly measure this when it comes to LED lighting. Part of this is a carry over from CFL discussions and the knowledge that for most light sources there is a difference between the rated luminous flux of the lamp and actual performance in a luminaire. A manufacturer’s individual performance claims for the LED lamp and driver may seem of little value if the luminaire is evaluated as a complete system. The LED Clearlight is unique as the Clearlight is both bulb and fixture: encompassing optics, light source, and driver in one when wired into the fixture. The Clearlight is the luminaire. The NEMA Type 5 dusk-till-dawn fixture is merely the electrical conduit and support for the Clearlight. It does not impact direction, optics, or intensity.
    Power Factor
    Power factor is defined as the ratio of the real power flowing to the load to the apparent power. In an electric power system, a load with low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. A low power factor is not only inefficient, it can be expensive. It can reduce an electrical system’s distribution capacity by increasing current flow and cause voltage drops. Some utilities impose low power factor penalties.

    The Clearlight has a high power factor of  > .9, very close to unity. Typically, a HPS lamp has approximately a 0.5 power factor. What is worse, because HPS lamps have a warm up time they might start out with an even lower power factor of .25 and gradually increase to the .49 over a period of 15 to 20 minutes. This is significant because at a power factor of .25 the lamp is pulling over 4x the amount of power it should. For example, a 100 watt HPS would actually be pulling over 400W at first and slowly decrease as it warms up. This increases the demand on the grid. If you have a large number of HID lights coming on at the same time, say at dusk, there is a significant spike in energy consumption. LED lamps have no warm up time. Spikes are eliminated and the true and apparent power are almost equal

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