The purpose of this report is to review the main methods in use for luminous flux measurements. One of these methods is used primarily by national standards laboratories (calculation from illuminance or luminance distribution), one is widely used in industry (measurement with an integrating sphere), while yet another form of measurement can be carried out in the limited number of industrial laboratories with access to a goniophotometer for measuring luminous intensity distributions. While each of the user groups will be primarily interested in the method in use in its field, it is necessary for a reference work on luminous flux measurements to cover all the main methods used for this purpose and to put them in perspective relative to each other.