amplitude has a quite specific meaning it is the height of the crest or depth of the
trough of a particular wavelength. but yes, the intensity of different wavelenghts
is different for different light sources. even sunlight has different intensities
rather than being even across the entire vis. spectrum.
I will have the relevent information up on the website later today or tomorrow.
http://puregold.aquaria.net/ws_fall0..._fall2002.html
we have been covering the EMS in class this last couple of weeks.
actually, I do have a gif that shows what happens to the EMS from the sun when it
hits earth, including what happens to visible light 25 meters and 100 meters under
water. sorry, nothing 18 inches down. if you want it, I will send it to you, send
request to
Ingrid

leading the reader to think the relative
amplitudes at all frequencies were the same, and just the overall
intensity was lower, when you actually meant that all the lights had
components in all the frequencies at varying amplitudes. I wonder if
fluorescents actually have any nulls?!?

It would be instructive to see a chart of sunlight spectrum vs. amplitude
recorded underwater at a depth of about 18". Are you aware of anyone
having done this? I imagine there would be a somewhat linear attenuation
of the longer wavelengths making it shift red. Then someone could invent
a fully submerged light (variable of course) with a thermostat, to double
as a heater and plant-spectra light source (and we could all throw away
our light hoods). It might need a small stainless steel heat sink above
water if the total BTUs were more than what was needed to heat the tank,
but that's a small technical problem )

NetMax ...wandering mind again


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