Re: Inspection lumens for Ford
I think it would be rather presumptuous to have a lighting standard - each inspection location could require very different requirements. How about visual under black light? Get my point? Now, that said, having your standards -for each area - is a good idea. The reason why this even comes up is the same reason why automotive ever wants something put into a standard - somebody used the excuse one too many times as a reason why something bad happened. Here, it is likely somebody used the excuse there was not enough light to do the inspection and the operator missed it. Usually, somebody drops in a 100% inspection on line as a corrective action - but does not provide adequate lighting to do it in that location.
Preventive checking of the lighting with a light meter is also a good idea. Many people do not realize that their lighting lumens drops off - slowly - over time. Hi pressure lighting is chronic for that - and you don't notice. It rarely "burns out" like old incandescent. So, after a while people start putting up auxiliary lighting - when all they needed to do was change their ceiling bulbs!
Attached is an excerpt from the Extech light meter manual - really broad brush....but that may be appropriate.