How to control Fuchsia flowering?

This is a one off gardening "discovery".  Take a look at these two Fuchsia 'Genii" plants photographed today...

The one on the left has been planted in a sunny bed for several years.  The other one was in a pot in a fairly shady location for a similar period - until about a month ago when I moved the container into the sun.

As one might expect, the "shady" plant has mainly green leaves rather than the yellow-green in the sun.  It didn't have many flowers either. 

Now that the previously shaded plant is in the sun, this seems to have triggered lots of flowering.

This suggests that the way to get a great floral display from a Fuchsia is to keep it fairly shady and then expose it to bright sunshine when you want a display? Of course, the display may be short-lived!