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Old 25-06-2004, 12:07 AM
kev
 
Posts: n/a
Default idiot query re. plants and lighting...

On 24 Jun 2004, the world was enlightened by sophie's opinion about...

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?

snip

Here's a quick explanation:

http://www.csun.edu/~hchum001/bookca...96/kelvin.html


kev

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Civilization.

An organized system of alternatives to the stone age - CJCherryh