In article . com,
dfreas wrote:
Very nice. I wish I could get my red plants to look as good. For some
reason the red plant I put in my tank immediately lost most of its red
and then stoped growing. Not that I have a ton of experience there -
I've tried two both of the same species (can't recall the name at the
moment). Neither died - they just refuse to grow. Some sort of red
sword plant - in fact it may have even been sold as "red sword."


A lot of things get sold as red swords. Some actually are swords;
I've seen lillies sold as "red swords".

Things that influence red in plants are bright light (the phots posted were
under 80W of compact fluorescent; the leaves were only 3-4" from the light)

Although, I get decent reds n Ludwigia repens with not much light -
plants are quite variable.

There is some chemistry to it, plants need nitrogen (and magnesium)
to make chlorophyl, so, low values in these two brings the red up.

--
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To solve the overheating problems in my rain-gutter strip, I painted
the gutter black (radiates heat better than white) and drilled 4 -
3/16" vent holes per 20W light. The vent holes are behind the
reflector, so no gets out. Stays warm, but no discoloration after 6 mo.

On 2005-03-05, dfreas wrote:
be clear, the side with the 3500K bulb is yellow). However to my eye
the new bulb looks quite a bit dimmer. I guess this is just the
difference between a 25W bulb and a 19W bulb showing up but I'm not
sure which one will be better in the long run.


The reason the soft white bulb seems brighter is because the spectrum
that it emits is more senstive to human eyes than the 6500K bulb.

--
"I have to decide between two equally frightening options.
If I wanted to do that, I'd vote." --Duckman

This is just plain wrong. The peak emission wavelength of a 3500K
blackbody is 828nm while the peak emission wavelength of a 6500K
blackbody is 445nm. The visible spectrum extends from approximately
400nm (violet) to 700nm (red) so 828nm would be outside the visible
spectrum in the infrared section while 445nm would be clearly visible.

Watt for watt a 6500K bulb will always appear brighter to the human eye
than a 3500K bulb. The *only* reason that the 6500K bulb looks dimmer
here is because it is 6 watts lower.

-Daniel