^^ I find some of your skepticism and charges a little annoying. Not because you question . But you make accusations. Forgive me. But if you have qualifications in electrical engineering that make you question the accuracy of the design parameters in the article, I would like to know what those qualifications are ?
Actually I don't think you even read the article
because , several of your questions were answered in it. If so, maybe you should read it again, slower this time.
He specifically stated that he would keep the theory to a minimum to shorten the article. He also stated that the topic could very well consume a catalog. As well he acknowledged that the topic of lighting a space is subjective .
The design parameters as stated in the article are guidelines based on commonly accepted standards and the writers opinion . There are not hard and fast rules.
Obviously there is a lot of leeway between 50 and 100 footcandles. If 50 or 30 works for you, fine.
Its interesting that several skeptical commenters followed his design parameters and gave the article high marks and were surprised at the difference it made in their shops. Over 50 comments. Most if not all
As a side-note: Typically where several banks of lights are needed in a larger shop,banks are independantly switched, so only needed banks are used.
Sorry to get side-tracked. The article is a great reference and I highly recommend it .
For anyone interested ,below is a statement and the qualifications of the author .
"Dave Anderson, a Moderator of the forum, asked that I include my qualifications to write the article so here goes."
"I retired as a Senior Engineer from a major west coast electric utility where I specialized in lighting for over 25 years. My main responsibilities were providing assistance to commercial and industrial customers on lighting, training company personnel, and evaluating new lighting equipment. "
"I taught evening classes in lighting design at a couple of community colleges and a course in Illumination Engineering at a state university, and wrote “Applied Illumination Engineering” which was used as a text for those classes."
"I also wrote a monthly column on lighting for Electrical Contractor magazine, and have authored and presented numerous technical papers on lighting to IEEE, IESNA, and AEE. "
"I’ve served as an advisor to the California Energy Commission on the development of the lighting portion of their energy code and as a charter member of their Advance Lighting Professional Advisory Group."
"I am a Fellow of the Illuminating Engineering Society of North America and have served as President of that organization."