noun
- Plural of carcel; a unit of illumination or a type of oil lamp used as a standard for measuring light intensity.
Usage: technical; historical; primarily used in physics and lighting contexts
Examples
- The laboratory used carcels as the standard reference for calibrating light meters.
- Early photometry experiments relied on carcels to establish consistent measurements of luminous intensity.
- The physicist compared the brightness of the new bulb against several carcels.
- Carcels were once common in scientific settings before modern lighting standards were adopted.