Hefner lamp
![Hefner lamp or in German Hefnerkerze](/Images/godic/202501/17/Hefnerlampe2552.png")
The Hefner lamp, or in German Hefnerkerze, is a flame lamp used in photometry that burns amyl acetate.
The lamp was invented by Friedrich von Hefner-Alteneck in 1884 and he proposed its use as a standard flame for photometric purposes with a luminous intensity unit of the Hefnerkerze (HK). The lamp was specified as having a 40 mm flame height and an 8 mm diameter wick.