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Apostilb

Unit of luminance

Unit of luminance

The apostilb is an obsolete unit of luminance. The SI unit of luminance is the candela per square metre (cd/m2). In 1942 Parry Moon proposed to rename the apostilb the blondel, after the French physicist André Blondel. The symbol for the apostilb is asb.

The apostilb is defined in terms of another unit of luminance, the stilb (sb): :1 asb = 1/ ⋅ 10−4 sb : asb = 1 cd/m2

Table of SI photometry quantities for reference

References

References

  1. (1978). "IPS Perimetric Standards, 1978". Imaging and Perimetry Society.
  2. Moon, Parry. (June 1942). "A system of photometric concepts". Journal of the Optical Society of America.
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units-of-luminance centimetre–gram–second-system-of-units
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