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  • Lighting of outdoor area including streets, roadways, parking lots, pedestrian areas is currently dominated by MH (metal halide) and HPS (high pressure sodium) sources. Recent advances in LED technology have resulted in a new option for outdoor area lighting, with several advantages over MH and HPS sources. Pozeen’s well-designed LED outdoor luminaires can provide the required surface illuminance using less energy and with improved uniformity, compared to HID sources. Pozeen’s outdoor LED luminaires also have significantly longer life (50,000 hours or more, compared to 15,000 to 35,000 hours) with better lumen maintenance. These LED luminaires also features no mercury, lead or other unknown disposal hazards; instant on without warm-up time or restrike delay.
  • Lighting of outdoor area including streets, roadways, parking lots, pedestrian areas is currently dominated by MH (metal halide) and HPS (high pressure sodium) sources. Recent advances in LED technology have resulted in a new option for outdoor area lighting, with several advantages over MH and HPS sources. Pozeen's well-designed LED outdoor luminaires can provide the required surface illuminance using less energy and with improved uniformity, compared to HID sources. Pozeen's outdoor LED luminaires also have significantly longer life (50,000 hours or more, compared to 15,000 to 35,000 hours) with better lumen maintenance. These LED luminaires also features no mercury, lead or other unknown disposal hazards; instant on without warm-up time or restrike delay.

    Many issues enter into design and specification decisions for outdoor area lighting. These include energy efficiency and lighting quality, durability, life and lumen maintenance, light distribution.

    Energy efficiency and lighting quality

    The goal of outdoor area lighting is to provide the necessary illuminance in the target area, with appropriate lighting quality at the lowest power consumption. Energy effectiveness encompasses luminous efficacy of the light source and appropriate power supply in lumens per watt (lm/W), optical efficiency of the luminaire (light fixture), and how well the luminaire delivers light to the target area without casting in unintended directions.

    Table 1 provides photometric data between HPS, MH and Pozeen outdoor LED luminaires, to illustrate basic comparisons.

    Table 2 compares measured illuminance data between 70W HPS and Pozeen 40W outdoor LED luminaire. Note that in this installation, the uniformity was improved by using Pozeen LED luminaire. The maximum illuminance decreased and the minimum illuminance was slightly higher than the HPS, which led to a lower uniformity ratio. It’s evident that “hot spots” are visible under the HPS luminaires. This overlighting represents wasted energy, and may decrease visibility since it forces adaptation of the eye when looking from brighter to darker areas.

    Durability

    Outdoor lights often become perches for birds and the debris that comes with them. Pozeen outdoor LED luminaire would not collect and retain dirt or water on the top side, and the optical chamber would remain clean to truly reduce maintenance.

    Pozeen outdoor LED luminaires are backed up for 5 years warranty. The luminaires are all IP65 rated and dust and moisture resistant. The design of a quick disconnect point between the light engine and the drivers will allow for field maintenance on the power supply. Keeping the maintenance contact points to this level reduces the opportunity for installation mishaps that create reliability issues during normal use.

    Life and lumen maintenance

    Pozeen defines useful life based on the estimated time at which LED light output will depreciate to 70% of its initial rating; often the target is 50,000 hours for interior luminaires, but some outdoor luminaires are designed for much longer useful lives of 100,000 to 150,000 hours.

    LEDs, power supply and thermal management are the three key factors to determine the useful life of the luminaire.

    By selecting LM80 LEDs and high performance power supplies, controlling the drive current and LED junction temperature, the useful life of Pozeen outdoor luminaires is usually greatly increased. With the help of TM-21 model, the predicted useful life is at least 100,000 hours.

    Light distribution and glare

    LED luminaires use different optics than MH or HPS lamps because each LED is, in effect, an individual point source. Effective luminaire design exploiting the directional nature of LED light emission can translate to lower optical losses, higher luminaire efficacy, more precise cutoff of backlight and uplight, and more uniform distribution of light across the target area. Better surface illuminance uniformity and higher levels of vertical illuminance are possible with LEDs and close-coupled optics, compared to HID luminaires.

    Polar plots given in photometric reports depict the pattern of light emitted through the 90° (horizontal) plane and 0° (vertical) plane. In general, look for a reduction in luminous intensity in the 70° to 90° vertical angles to avoid glare and light trespass; zero to little intensity emitted between 90° and 100°, the angles which contribute most seriously to skyglow; and much reduced light between 100° and 180° (zenith) which also contribute to skyglow. Figures 1 and 2 illustrate the forward light and uplight angles referenced in the Luminaire Classification System (LCS). Luminaires for outdoor area lighting are classified in terms of the light patterns they provide on the ground plane. Figure 3 shows IESNA outdoor fixture types classifying the distributions for spacing luminaires.

    Pozeen’s products conforms to IESNA requirements for designing roadway and parking lot lighting rather than just designing for average illuminance on the paving surface. Illuminance alone does not consider the disabling glare that reduces visibility for the driver. For example, although an IES Type I or Type II distribution may provide the most uniform spread of illuminance with the widest pole spacing along a roadway, the angles of light that allow the very wide spacing are often the angles that subject the driver and pedestrian to disability and discomfort glare.

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