In article <930523230752_72103.765_DHS47-1 at CompuServe.COM>, 72103.765 at CompuServe.COM ("Richard B. Peterson") writes:
> Hi,
> I am interested in putting together a high intensity light
> source comprised of light emitting diodes (LEDs) for use in
> photosynthetic measurements. . . .
[stuff deleted]
> I would like a maximum intensity (PAR)
> at the leaf surface which is equivalent to full sunlight. This
> is about 400 mW over a 10 sq cm area. Based on some
> preliminary measurements I estimate that the necessary maximum
> flux could be acheived if I could collect light from 50-100
> LEDs. Has anyone attempted anything like this using, perhaps,
> integrating sphere physics? Alternatively, are there any
> North American companies which specialize in fiberoptic
> coupling to LEDs? The latter idea is based on collecting the
> light from an individual LED into an optical fiber then
> bundling all the fibers.
>> Richard B. Peterson New Haven, CT USA
>I have in front of me the Hansatech catalogue which lists a light source
consisting of 36 ultra-bright LEDs which is supposed to give 1000
micro-mols per sq. metre per second (i.e. about half of full sunlight).
This is run off a control box which can be interfaced to a PC.
List price for LED assembly (LH36U) is 380 pounds sterling.
List price for control box (LC1) is 500 pounds sterling.
You can contact Hansatech by Fax - +44 760 337303
or by phone - +44 760 338877
My only connection with Hansatech is as a customer.
You should also check out Walz (Germany) who make the PAM fluorescence
system. Sorry, but I don't have any specific information.
--
' Jonathan B. Marder
Internet: MARDER at AGRI.HUJI.AC.IL | Department of Agricultural Botany
Bitnet: MARDER at HUJIAGRI | /\/ The Hebrew University of Jerusalem
Phone: (08 or +9728) 481918 |/ \ Faculty of Agriculture
Fax: (08 or +9728) 467763 / P.O.Box 12, Rehovot 76100, ISRAEL
