Is there any scientific source (link / book) which deals with the
fact the algae use basically blue and plants need only red ?

I don't believe everything I read ;-)

Very smart of you. :-)

I've also heard that "blue light causes algae" thing, and there may be
something to it. But a lot of people grow plants under blueish lights (like
those 50% actinic SmartLites) just fine. I'm skeptical about the idea that you
can control algae just by light spectrum.

But if there is any solid info, I'd be interested in seeing it, too.



Leigh

http://www.fortunecity.com/lavender/halloween/881/