Bryan Bankhead wrote:
>> Does anyone have any experiece with using qtz. halogen lights as sole
> source of illumination for plants? I have heard conflicting things about
> whether they were useful.
The quartz/halogen principle permits a very hot bulb envelope to be used
which does not blacken because of metal evaporating from the filament
being deposited on the envelope. The light produced is essentially
black-body radiation at the colour temperature of the filament but the
heat output in the infra-red region is intense: you can literally cook
with these lights ...
I've used quartz-halogen lamps for illumination during short-term
experiments where high light intensity (or narrow bandwidth filters)
were needed. However, they are probably better suited to heating a
greenhouse, than providing supplimentary illumination!
Dr. A.J.Travis, | mailto:ajt at rri.sari.ac.uk
Rowett Research Institute, | http://www.rri.sari.ac.uk/~ajt
Greenburn Road, Bucksburn, | phone:+44 (0)1224 712751
Aberdeen AB2 9SB, Scotland, UK. | fax:+44 (0)1224 716687