[Coral-List] PAR intensity of different kelvin globes
Steve Dalton
sdalton at nmsc.edu.au
Thu Aug 10 22:53:19 EDT 2006
I recently purchased two 400watt metal halide lights and two what I assumed
were 14000 kelvin globes to conduct some coral bleaching experiments on
subtropical hard corals. After setting up the experiment I was not able to
get consistent PAR intensity across all temperature treatment so I had to
purchase another 400 watt light. The problem was that the globe that were
provided with the additional fitting appeared more blue than the original
globes and when I measured the PAR intensity output of the three individual
lights the two globe which were first purchased were nearly twice the value
of the more blue light. The supplier indicated that the third globe was a
different brand and so sent another globe that was the same brand as the
first two. This did not solve the problem because the new globe was still
noticeably bluer than the original ones and the PAR output was still
considerably less. Could it be that the original globes were a lower
kelvin value say about 100000K which would explain why they were less blue
than other globes? Or the more blue globes are 200000K and marked
incorrectly. Does anyone know how I can tell what kelvin rating these
globes are and whether PAR intensity decreases with kelvin rating when the
globes have the same watt rating?
If anyone can help me regarding these question I would really appreciate
your comments
Cheers
Steven Dalton
PhD student
University of New England
NMSC Postgraduate Representative
National Marine Science Centre
Bay Drive, Charlesworth Bay
(PO Box J321)
Coffs Harbour, NSW Australia 2450
Ph: 6648 3928
Mob: 0432 946 782
sdalton at nmsc.edu.au
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