phot = -------------
Try converting from "ph" to apostilb, 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.
ph = 31,415.93 apostilb, 31,415.93 blondel, 3.14 equiv phot (equivalent phot), 2,918.64 footlambert, 3.14 lambert, 10,000 nit, 1 phot, 31,415,926.54 skot, 1 stilb.
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