Yeh I realised I did not have a voltage measurement after I posted the message. The ammeter on the battery supply read 25 amps - this would be accurate I assume? Unfortunately as I have just got the light dimmer in place I probably won't be going back to test the voltage!
The anodising thickness I simply measured over the diameter of a 25mm tube - before and after the process. I could also compare the results to previous layer thicknesses carried out at lower voltages/current densities (which were negligible)
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