apostilb = 0.318309886183791 luminance
Try converting from "apostilb" to blondel, equiv phot (equivalent phot), footlambert, lambert, nit, phot, skot, stilb, or any combination of units which equate to "luminous intensity / length squared" and represent luminance.
apostilb = 1 blondel, .0001 equiv phot (equivalent phot), .09290304 footlambert, .0001 lambert, .31830989 nit, .00003183 phot, 1,000 skot, .00003183 stilb.
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