I have no greenhouse and I always lose a lot of the cuttings and
seedlings of hardy plants which I try to overwinter in a cold frame.

I am considering rigging up an illuminated spot in a spare part of my
garage where the young plants could stay during the worst part of the
winter. An area of around 2'6"" x 2'6"" would do very nicely.

I have had a look at a few web sites, all of which were produced by
folk who appear to be unable to express themselves unambiguously.

Who is prepared to post some advice on lighting requirements?

Franz