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Lighting with LEDs

Courtesy of AMS Technologies, AG

At a world renown German research institute, LED-lighting is used to simulate the sun during experiments on plant and animal growth. The lighting systems are mounted inside large dark rooms and emulate the sun's day/night cycle. During their experiments, researchers use a special wavelength to accelerate plant growth.

Significant heat is generated by each lighting system and must be dissipated by a 7 ft x 2 ft cold plate attached to it. Because temperature influences the wavelength emitted by the LEDs, each cold plate has to provide a uniform temperature distribution across its surface. To design the cold plates, the lighting controls manufacturer, a global leader in LED lighting and power solutions, contracted with thermal consulting expert, AMS in Munich.

Forced water cooling was selected as a simple, cost-effective, low-weight approach with the coolant tubing looped back and forth along the length of the cooling plate. Using Coolit, AMS analyzed the impact of various design parameters, such as the number of tubing loops, pitch, flow velocity, and interface material used between the PCBs and the cold plate. When the Coolit optimized design was tested, it verified the prediction accuracy and satisfied all the cooling requirements.

Coolit predicts temperature distribution of cold panel mounted LEDs.
LED arrays will replace these existing neon fixtures in greenhouse experiments.

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