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  • Wuxi Kinglux Glass Lens Co.Ltd
  • ADD:No.286,Changjiang North Rd,New Dist,Wuxi,JS prov,China
  • Tel: 86-510-66759801
  • Fax: 86-510-84602998
  • Mobile phone: 86-18168862789
  • E-mail: ledglasslens@163.com
  • Contact person: Huimin Zhang
    Apr 17, 2018

    led highway lighting

    Highway authorities have an important responsibility of providing safe roadway illumination within a state or local budget. Advances in LED highway lighting technology are providing an opportunity to not only produce the optimal lighting; but also, save energy in the process.  The cost of high performance, high quality LED lighting will typically be recouped several times over a project’s lifespan due to energy savings and decreased maintenance material and labor costs.

    Advances in LED Highway Lighting

    Many factors contribute to selecting the LED fixture light distribution for a given roadway application.  Lighting patterns ranging from a very thin oval pattern to near circular patterns are described as types I, II, III, IV, and V distributions.  Lighting for medium width roadways (two to 4 lanes) is typically accomplished with Type III lighting and a pole placed near the outside roadside curb to distribute light at roughly forty degrees from the perpendicular centerline of the fixture.  This pattern throws light approximately twice as wide, parallel to the road, as it throws it across the road perpendicularly.  Other distributions are suitable for centerline placement, ramps, interchanges and other applications.  SpecGrade LED high mast fixtures are available in all common distributions with custom options for many other patterns as needed.

    One of the lighting objectives a designer is working to optimize is a continuous beam uniformity across extended roadway sections.  Drivers experience less fatigue when lighting fluctuations are minimized – directly translating to a safer driving environment.   Glare is another lighting condition that can quickly fatigue a driver.  Careful pole placement and height can minimize dangerous glare conditions, but additional louvers, visors, or shields are often necessary to take care of conditions where opposing roadways or ramps catch a light glare that needs to be  eliminated.  SpecGrade LED has a full range of shields with IES photometric files available for analysis as needed.  Custom shields, optics configurations, and partial fixture dimming can be ordered by contacting the SpecGrade LED engineering department.

    High Quality LED Roadway Lighting

    led highway lightsHigh quality LED lighting approaches 60% more efficient than a comparable metal halide fixture.  For instance, a SpecGrade LED 1000 Watt high mast fixture can replace a 2500 W MH fixture.  Due to the patent pending thermally optimized fixture design; combined with high quality Philips Lumileds Luxeon T LEDs, the SpecGrade LED high mast fixtures are designed with an expected life exceeding 100,000 runtime hours.  

    The power supply/drivers are similarly high quality Philips Xitanium products with lifetimes rated to 100,000 hrs.  SpecGrade LED offers a 10 year LED board / 5 year driver warranty which means you could relamp traditional fixtures over six times before the LED product needs service.  In just that 10-yr period, a single 1000W LED fixture should save $8500 in energy costs (assumes national avg 13¢/KWH, 12 hr/night use) vs. a comparable metal halide lamp.  Relamping labor and material costs during this same 10-yr period could exceed $500, bringing the total cost of ownership difference to a $9000 savings per 1000W LED fixture in a 10-yr period.  Compare this to the first cost of perhaps $2000 more for the same LED fixture and it still comes out to $7000 per fixture cost savings!  

    Making the Investment in LED Highway Lighting

    Energy cost can be further reduced by using controls that can dim or cut out lights that are not needed due to time of day, traffic levels, local events or weather conditions.  For extra critical areas such as on/off exchanges and toll areas, redundant or back-up lights can be available to switch on if a failure does occur.  For instance, back-up lighting could be powered by generators that automatically start on a power failure.  Supplemental solar or wind power can provide a majority of the power by charging during the day and running an AC inverter most of the night for the lighting.  Use of the AC line power can take over and build charge as needed so the system can be optimally designed for average vs worst case.  Contact the SpecGrade LED engineering staff to assist in your analysis or for the design of such a system.