AN ADJUSTABLE LIGHT SOURCE FOR PHOTO–PHYTO RELATED RESEARCH AND YOUNG PLANT PRODUCTION

A flexible light source, entitled LEDSet, was developed suitable for the research on photobiological responses of 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 super–bright light–emitting 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 or sideward light source depends on the installation and 120 .mol·m–2·s–1 mean light intensity at a 10–cm distance when given 20 mA forward working current to each light–emitting 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 the device developed to demonstrate its applications on both production and research on photosynthesis and energy savings.

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