While still quite early in development, within street lamps, solar power LED driven street lamps are becoming more and more prevalent. As the solar panels see only 8V at night and up to 36V during the day, a buck boost is required to step up or down the voltage to the required 24Vdc for the battery. Here, the LM5118 buck boost controller is serving this purpose and the LED is being driven by TI's LM3402 LED driver.