illuminance = 1 illuminance (illuminance)
Try converting from "illumination" 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.
illumination = .29186351 equiv footcandle (equivalent footcandle), 3.14 equiv lux (equivalent lux), .09290304 footcandle, 1 lux, 1,000 nox.
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