Measurement of directional non-uniformity of the correlated color temperature of LED luminaires for road lighting

This master's thesis deals with the topic of correlated color temperature measurements. There has been an increase in the demand for accurate correlated color temperature measurements due to regulations concerning reconstruction of the street lighting made by Department of Industry and Business. The main objective of this work is to determine which measuring devices and methods would make correlated color temperature measurements to be done in the most accurate and practical way. The evaluation is based on five laboratory measurements and two outdoor measurements. The main subject of these measurements is biodynamic LED lamp Tungsram SLBt. A verification of certain output data as well as simulating situations that would be too difficult to measure is made by an algorithm created in Matlab software. Final part of the thesis deals with the accuracy differences among various correlated color temperature measuring methods. It describes advantages and disadvantages of these methods and proposes ideas for consequent inquiry. This thesis finds its use in correlated color temperature measurement error and uncertainty discoveries that will have to be dealt with in the future. Also, theoretical part of the thesis may be used as lighting technics learning material