A is out because the Amperage drops linearly from Vmax as V goes down. B is also out because 12 x 6 is only 72 and thats the power it consumes, and since pelts are definitely not so efficient, the figure 86w is too far off.
It would be like what Brad has said, somewhere ~ 50w, since it consumes around 72w of electricity at 12v.
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