 | 1899 High-purity quartz glass melted by Richard Küch |
 | 1904 Quartz glass arc lamp emitting UV light invented at Heraeus |
 | 1911 Start of the success of the Höhensonne |
 | 1920s Launch of the Original Hanau brand |
 | 1973 Heraeus takes over all shares of Quarzlampengesellschaft |
 | 1992 Heraeus Noblelight GmbH founded to merge UV and infrared activities of the Heraeus group |
 | 2007 HN Sunlight GmbH foundation |
