No, it's true for bulbs too.
Nice article though, thanks Ingrid.
The color, as stated, is an indication of what a black body would be at that temperature.
Not that fact that the gasses are heated to 5000K and are emitting light at that temp.
I think you have the scale of color and the way the light is created confused.
After daylight the scale is estimated, BTW daylight is considered to be 6500K not 5000K
even though a lot of manufacturers call 5000K and 5500K bulbs daylight.
Most plants can convert light that is given in peaks and troughs (like artificial light) to
a useable form of energy so even though the broken down spectrum is very different than the
sunlight spectrum (which is smooth, no peaks and troughs) the plants treat it almost the
same as long as the color is similar.
Make sense?
Simon

wrote:

this is only true for hot body.. for gas emission lights (fluorescent) that is not
true.
http://users.megapathdsl.net/~solo/w...m_physics.html
Ingrid

It refers to the temperature a black body would have to be to create
that light.
You know red hot, white hot etc, that is the thing. If you could heat a
piece of steel to 5000 degrees K it would look like daylight, instead of
just red hot.