Abstract
An irradiance and plant temperature monitor/controller has been developed and is being tested for use in controlled environments and in commercial greenhouses. Photosynthetic photon flux density was monitored using a quantum sensor, while plant temperature was monitored with an infrared thermometer. A microprocessor integrated the signals from each sensor and permitted a choice of priority control of high-intensity discharge (HID) lamps or infrared (IR) heaters for control of plant temperature. It also permits dimming of HID lamps inversely proportional to natural irradiance. Effects of the monitor/controller changes on high-pressure sodium lamp output to input ratio, lamp life and dimming response time will be illustrated. The effects of irradiance variations on leaf heating and cooling are presented.
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