Abstract
The present interest in photometric data has led to a re-examination of the degree of accuracy and reproducibility reasonably attainable in the photometry of lighting fittings. Practical difficulties limit the degree of accuracy obtainable; care must be exercised in the planning and execution of a test for the data obtained to be of real value.
This paper reviews the type of data required, and the basic test equipment necessary. The design of typical test procedures is discussed, with particular attention to details which contribute substantially to consistency and accuracy of results. Special requirements associated with certain discharge lamps are included, and some time-saving aids are described.
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