becflanders wrote:
Are LED's effective? I always think they don't really throw out the
right sort of light? It tends to be a bit clinical, even more than the
fluro lights??

It depends on the colour. See the graph to the right he

http://en.wikipedia.org/wiki/Chlorophyll

Whether it looks clinical or "natural" to you green plants absorb light in
certain bands, if those are there all is well. If the light is in other
parts of the spectrum (eg green) it is wasted.

The fluorescent tubes designed for grow lights have a lilac tinge to them as
they are made to emit in both the red and blue ends of the spectrum. LED
lighting is more energy efficient than many other sources, whether a given
LED is powerful enough to support indoor plants is another question. At
least being cool you can place them close.

David