Interesting that different makes take different amounts of time to light up. There are people who object to energy-saving bulbs because of their slowness (presumably having had experience of only the worse kind), and lack of detailed information makes it difficult to convince them that the bulbs really are usable; though there are also people who claim that the bulbs' manufacturing process is more energy-intensive and cancels out the benefit of using them. I don't know how they get that idea.

feanelwa and I were talking about the need for measures and data to put into the discussion of energy-saving practice (or perhaps I was soapboxing at her...). Your graphs are the kind of thing that Energy21 collects. Unfortunately their site is being changed - http://www.energy21.co.uk/ says the old email is still working.