In article ,
Dr Engelbert Buxbaum wrote:
Richard Sexton wrote:

I've proved to myself that warm white work evry bit
as good.

May well work, because the "light colour" of fluorescent tubes has
little to do with spectral composition, as I explained in a different
thread.

Understood, but plants don't care what you use as long as it's
intense enough. I've heard people voice the ida a 15W super fancy
designer tubeis better than a 40W warm white. We call these people
"ones that have not actually tried this".

If you want to go crasy you could add a cool white or daylight
as well, which is, by golly, what people used to use before all those
short lived designer pink petshop tubes came out.

Designer pink is plain ugly, I'd never use them. What I was recomending
is not those so-called "grow lights", but "tropicals" which have a
higher red contend than many standard tubes. Their light appears white
around 6000 K, IIRC.

5000K is white, the "color of noonday tropical sunlight".

6700 is "nortlight" the color of Swedish daylight at noon.

6000K wold be, uh, Pensicola Florida at 2 pm or something :-)

I don't mind the pink tubes. Works good for some combinations
of fish and plants.

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