"Alan Gould" wrote in message
...
In article , Franz Heymann
notfranz.
writes

My problem is essentially to find out quantitatively how many
lamps,
of what power, at what distance from the plants, to use.

The manufacturers will almost certainly be able to advise you on
that.

But I don't necessarily want to use any lamps sold as horticultural
apparatus, because the chances are that I will decide on using a
battery of ordinary household bayonet fitting fluorescent lamps,
because they are items which we use in the house anyway. I have
looked at their spectra, and they are as best I can judge identical
with those of the lamps usually used in horticultural circles.
Essentially, the information I want is
How many lumens per square metre do I need for overwintering rooted
cuttings of typical hardy plants?
How many lumens per square metre does the lamp provide at specific
distances?

Franz