Abstract
A flexible light source, entitled LEDSet, was developed suitable for the research on photobiological responsesof plantlets in vitro and for the young plant production. The device allows the light intensity, light quality, duty ratio (0~100%)and frequency (0~5 kHz) to be controlled. The components of the device include superbright lightemitting diodes (LEDs),mounting fixture, and driver. The LEDs are commercially available with peak emissions in the red (645.20 nm) and blue(460.20 nm) bands. In each LEDSet, there are four blue and nine red LEDs installed. This device can provide downward orsideward light source depends on the installation and 120 .molm2s1 mean light intensity at a 10cm distance when given20 mA forward working current to each lightemitting diode of LEDSet. Experiments on the growth of Phalaenopsis (Phal.White Dream . Enshyu) and potato (Solanum tuberosum L. Kennebec) tissue culture plantlets were conducted using thedevice developed to demonstrate its applications on both production and research on photosynthesis and energy savings.
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