Posted: 13/08/2013 at 14:04
nanny, ripening is controlled by temperature, nothing else. Sunlight has direct no role to play beyond supplying temperature. Optimum temps for ripening are low-20sC and above. Below that, they will ripen, but more slowly the lower the temp goes. If the temps get down to low teens, they would be better off inside on the kitchen bench.
A tom's ripening process is actually an internal chemical process. The plant plays no actual role beyond sustaining the fruit. There also comes a point in the ripening process when the fruit actually stops drawing sustenance from the plant. The plant's job is done.