On Dec 30 2011, 5:04*pm, Michael Bell
wrote:
In message
* * * * * wrote:

In article
ups.com,
NT wrote:

If adding more CO2 helped growth, use of gas & paraffin heaters would
presumably be more widespread in greenhouses.
I saw a summary of some research on this a while back. *It's very
complicated, as you might expect, but far more plants suffer from
raised levels than benefit from them. *As you say, in the UK, light
is the main limit - but there a zillion other factors, and each
species has different requirements.
Regards,
Nick Maclaren.

OK, Let's discuss lighting. I have lost the original paperwork and the
hydroponics shop I bought it from is no longer there (Bust for
cannabis growing? How evil-minded can you get?) but searching through
the web, I am using a hood looking very like this

http://www.greenshorticulture.co.uk/...ts/CFL-Grow-Li...

except it has two lights side-by-side, and the lights are labelled
"Eco-light Grow 200W 220 - 240V 50 - 60Hz 6400K". They look "the
business" and I am sure they are. I have had this kit for 1 year and
they grew well last year, but due to a series of mishaps I am making a
later start this year. I want my seedlings to be big and strong, just
like a parent, and I am a craftsman and a maximalist. So how do I get
the seedlings big and strong? I can't see any way of giving them more
light,

You've not told us what type of lights they are. 200w 6400K suggests
mercury fluorescent, possibly folded into giant cfl format. You've not
told us how many plants, or how far away your lighting is from them.
If I were to add a 3rd light, I'd probably pick low pressure sodium,
or maybe replace one of the fluorescents with HPS.


NT