RELUX and DIAL present the new unified lighting data format for luminaires and sensors: GLDF. It could be used directly in RELUX and DIALux. GLDF is open and free available for everyone. Thanks to the joint forces the format is technically robust, modern, and universal. In the future it may replace other and older existing luminaire data formats, which is a huge benefit in creating of data on manufacturer side and a benefit for designers and luminaire data users in a reduced handling and an open structure. GLDF includes more capabilities as ROLF and ULD format combined.