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Luminell has designed a floodlight system designed to be carried by a multicopter UAS (writes Rory Jackson). The 250 W, 25,000 lumen DL 250 (standing for Drone Light 250) has 28 LEDs and is integrated with a microcontroller so that it can be connected directly to the flight controller on the UAS, and controlled through the microcontroller. “The biggest challenge was the low weight and absorbing the heat, with a power density of only 2.1 g/W,” said Vegard Humlen, at Luminell’s UAV Drone Light division. “We therefore used a purpose-designed metal core printed circuit board [MCPCB] to dissipate the heat, as well as aluminium frames, and we use the airstream from the UAV’s propellers for additional cooling. a switching frequency of 300 kHz. That makes it possible to record flicker-free filming with high-speed cameras. The microcontroller is also integrated with battery protection limits to avoid discharging the battery below the minimum voltage. Bright idea for multicopters Airborne vehicles The DL 250 floodlight produces 25,000 lumen from its 28 LEDs “We also have temperature sensors on the MCPCB. If they see the temperature approaching 90 C, which is the upper limit of what can be withstood by the components, they start to dim the LEDs.” The high-power LEDs are powered by five constant-current drivers, each with