High-power LED illumination system for photosynthetic research on potted plant canopies

Birgitte Thestrup; Carsten Dam-Hansen; Janni Bjerregaard Lund; Eva Rosenqvist

doi:10.1117/12.762636

13 February 2008 High-power LED illumination system for photosynthetic research on potted plant canopies

Birgitte Thestrup, Carsten Dam-Hansen, Janni Bjerregaard Lund, Eva Rosenqvist

Proceedings Volume 6910, Light-Emitting Diodes: Research, Manufacturing, and Applications XII; 69100V (2008) https://doi.org/10.1117/12.762636
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

The high energy efficiency and radiant flux of high-power LED devices has lead to many new applications of LED lighting. Within the more production oriented applied plant research, there is a need for illumination systems that ensures a high irradiance, spectral control and homogeneous illumination of a large plant canopy to ensure reproducible results over long term measurements. A new high power LED illumination system is presented. It has been designed and developed for illumination of a plant canopy area of 60 x 80 cm² in a climate chamber where photosynthesis of the whole canopy can be measured. The LED system extends the precise control of the chamber climate with computer control and long term stability of the irradiance and spectral composition of the illumination. High-power red and blue (at 455 and 639 nm) LED devices have been chosen that coincides with the absorption peaks of chlorophyll. The illumination system allows for a maximum irradiance of 6.3 W/cm² corresponding to a photosynthetic photon flux density (PPFD) of 300 μmol m^-2 s^-1. The spectral composition of the light given by the ratio of blue photons compared to the total number of red and blue photons can be adjusted from 0-40 % keeping the irradiance at a constant level. Spectroradiometric 2D grid measurement at the plant top level shows homogeneity of ± 5% of the irradiance and ± 5% of the spectral distribution, over almost the entire canopy area. Initial experiments carried out on Chrysanthemum plants showing the dependence of the photosynthesis on blue light fraction is presented and discussed.

Citation Download Citation

Birgitte Thestrup, Carsten Dam-Hansen, Janni Bjerregaard Lund, and Eva Rosenqvist "High-power LED illumination system for photosynthetic research on potted plant canopies", Proc. SPIE 6910, Light-Emitting Diodes: Research, Manufacturing, and Applications XII, 69100V (13 February 2008); https://doi.org/10.1117/12.762636

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Light emitting diodes

LED lighting

Photosynthesis

Climatology

Control systems

Absorption

Light sources and illumination

Show All Keywords

Keywords/Phrases

Search In:

Publication Years