Think mine cost more than $50 when I bought it, good read but only read once. If you have a collection, worth addition to it as a valuable collection/investment piece. if you don't really collect books than not crucial to have, more something to read in kind of like
McCandless understanding. If you design a lot, perhaps worth a re-read once in a while in having.
In my case since I fabricate or referb lighting fixtures more than design shows, Fuchs
Stage Lighting,
American Electrician's Handbook,
Theatre Lighting from A to Z by Boulanger,
Encyclopedia of Stage Lighting by Briggs, and obviously
Photometrics Handbook by Mum are on my ready access stack. For me
fixture research is the use for a large library of old lighting books - read all of them also. Books written over the years I collect often if only to get period pictures of lighting fixtures from them where such vendor catalogs are not found on the web or also in my collection. Helps in dating the
fixture I'm working on if I say have a 1948
book with a photo of the light. Even used some photos to fabricate missing parts.
Working on getting time to read
Light Fantastic by Keller and
The Event Safety Guide at the moment. Been sitting on them a few months now without cracking the
cover yet - limited time to sit down and read.. My
current reading
level is various Winnie the Pooh and other toddler books.