Response to XL1 sensitivity equals what film speed?

I found the XL-1 to be equivalent to about an ASA 160-200 under tungsten lighting. I did notice an anomoly outdoors with the effective ASA being around 320 depending on if it was overcast or not.

I did some my testing before the shoot and only tested under Tungsten lights and was surprised once the production began to discover the discrepency between Tungsten ASA and daylight ASA.

Anyone else find this to be true?

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