In message , The Outcaste
writes
On Wed, 23 Jun 2004 10:09:17 -0400, "RedForeman ©®"
bubbled forth the following:

IIRC, Sunlight is nearly 20,000k, or kelvins, a rating for light's 'power'
or 'strength'
Kelvins, or color temperature, refers to the color of light, not the
power or strength.

morning and evening sun averages 2500-3000 kelvins, noon sun
5400-6000K

Strangely enough, the color temperature of average summer shade is
rather blue, about 8,000K. Midday skylight (no direct sun) can range
from 9,500K to 30,000K.

Google on color temperature of sunlight for more info than you ever
wanted.

aaargh, physics! how can one unit (kelvin) refer to a temperature scale
AND the colour temperature of light?

Otherwise great points Red. IME, direct sunlight, even just an hour in
the early morning *always* led to opaque green glass in just a few
days (at least with unplanted tanks, haven't tried with a fully
planted tank). Direct sunlight can also heat up a smaller tank more
than you may want.

I think I bodged my initial explanation of the tank's position (see my
post to Red), for which I apologise. but so far I have no algae at all.

thanks for your (incredibly erudite!) advice, I think I'm starting to
get the picture...
--
sophie