Why, in the photochemical substitution of a ligand in a carbonyl complex, is a water-cooled lamp jacket required to separate the solution and the mercury vapour lamp? It's shown in Figure 22.16 of Atkins' Inorganic Chemistry.
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3$\begingroup$ For the benefit of those without the book you mention, it would help if you could add a description of the experiment in question. And welcome to Chemistry StackExchange! $\endgroup$ – user467 Oct 18 '13 at 0:38
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The main point is to stop the heat flow from the lamp, while allowing UV through. You want to do photochemistry, not thermochemistry.
