The International Daylight Measurement Programme has stimulated wide research in daylighting measurement analysis and modelling, however there are deficiencies in all these areas. Data collection, especially, is still limited geographically and some variables, such as cloud cover and distribution, have proved difficult to measure and have, consequently, largely been ignored. Furthermore, data that has been collected has limitations on its accuracy that does not appear to have been factored into much analysis and model building. This paper discusses errors associated with techniques of data gathering and measurement accuracy with examples. The extension of daylight measurement in tropical regions will not be immune from these potential sources of error even with superficially static daylight climates.
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