I realise the warmed air in my cartoon is flowing right up through the holes in the light fittings. Worse. Why do I keep thinking of Black Holes in space?  The heated bulbs act to pump the warm air out of my little galaxy. My cartoon is turning into a generator of junk joules! I act.

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These metal screw-on caps help make the light fitting airtight and limit the transfer of thermal energy by air convection. The metal fins on top of the cap act as ‘heat sinks’ and are designed to transfer thermal energy away from the light into the universe. As a result it is safe to tuck insulation up against them

 Chapter Three - A Holey Pilgrimage-In the Fashion Stakes.

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