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New Zealand Tablet, 30 November 1911, Page 2407

Where there is light there is heat, and where is intense light there is often intense heat, and further, where there are also inflammable moving-picture films, we may have disastrous fires. It will be welcome news, therefore, that a ‘ cold light ’ has been produced that can be used in the cinematograph, not only lessening the danger, but permitting the use of gelatipe films, and relieving lecturers, managers, insurance companies, and audiences of considerable nervous strain. Light without sensible heat has been hitherto obtainable in only two ways: first by exciting phosphorescence or luminescence electrically, especially in gases and second, by straining out the non-luminous heat-rays with some transparent substance like rock-salt, that does not transmit them.