Abstract
Light emitting diode (LED) street lamp heavily relies on
successful thermal management, which strongly affects the
optical extraction and the reliability/durability of the LED
lamp. In this study, a thermal resistance network model was
presented to estimate the maximum heat sink temperature of
the street lamp, which could be utilized to further evaluate the
thermal performance of the street lamp. Two high power LED
street lamps, an 114 watts and an 80 watts LED street lamp
were used to evaluate the present model. Their heat sink
temperatures were calculated by the model, the results showed
that the maximum heat sink temperature was about 61℃ at
the environment temperature of 25℃ for the 114 watts LED
street lamp. For the 80 watts LED street lamp, the maximum
heat sink temperature was about 42.5℃ at the environment
temperature of 11℃. To prove the model feasibility,
experimental investigations on the 114 watts and 80 watts
LED street lamp were conducted. The results demonstrated
that the heat sink temperature of the 114 watts LED street
lamp remained to be stable at about 60℃ after several hours’
lighting at the room temperature of 25℃. The heat sink
temperature of the 80 watts LED street lamp remained to be
stable at about 42℃ at the room temperature of 11℃.
Comparing the results achieved by the thermal resistance
model with the experimental results, it was found that the
proposed thermal resistance model could be used for
temperature estimation and thermal evaluation for the high
power street lamp.