illuminance = 1 illuminance (illuminance)
Try converting from "luminous exitance" to equiv footcandle (equivalent footcandle), equiv lux (equivalent lux), footcandle, lux, nox, or any combination of units which equate to "luminous intensity solid angle / length squared" and represent illuminance, illumination, or luminous exitance.
luminous exitance = .29186351 equiv footcandle (equivalent footcandle), 3.14 equiv lux (equivalent lux), .09290304 footcandle, 1 lux, 1,000 nox.
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