LED Street Lights and LED Flood Lights for hot environments have always presented some challenging technical issues.
Ambient temperatures in many Middle East regions can reach as much as 50°centigrade in the summer months and the effect of the thermal radiation due to direct sunlight on a luminaire could see the luminaire case temperature reach at least 85° centigrade. What affect will this have on LED Street lights?
Consider firstly that the maximum case temperature [TC] of any LED driver should not exceed 85° centigrade and given that the starting point temperature of the luminaire after a day in the Saudi sunshine is likely to be close to 85°centigrade, this is far from an ideal situation for LED Street Lights. Whilst the luminaire case temperature will start to reduce as the sun sets, the mass of the luminaire will retain a large amount of heat and once the luminaire is switched on, the LED Junction Temperature and the Driver Case Temperature will start to increase.
Recognising this, BSSLED developed a specific sun shade cover to protect its range of LED Street Lights and LED Flood Lights. Not only does this create a sun shade to prevent direct sunlight contact with the LED Street Light but, due to the shape of the LED Street Light Heat Sink, the sun cover also provides a degree of passive forced air cooling.
After substantial testing in Jeddah, Saudi Arabia the differential between using a sun cover over the luminaire and allowing direct contact with the LED Street Light casing is as much as 28°centigrade. Such temperature differences will extend the life of the Luminaire by a substantial amount of time.
The Osram OT165 Dim4 Driver within the LED Street Light has a number of features that allow it to reduce the output current in the event of the driver case temperature reaching above a set parameter together with an astronomic clock and step dimming capability to allow the LED Street Light to operate a reduced output levels during the quieter periods of the night and offer further energy savings. All BSSLED products are manufactured in the UK using Osram LED technology and include a full 5 Year Warranty and full EN safety approval certification.
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