Different kinds of stage lights/lamps/systems?

Does anyone know where I can find a book or preferably an iphone app which dictates (with pictures) which are the different kinds of stage lights used on rigs/sets? (e.g: fresnels, parcans, 1k, 2k, etc… ) So i can learn which are which and when they are used?
I'm new to being a technician and would like to do as much "home-learning" as possible so as not to be in the way!
I really appreciate the help.

The following site tells you the different types of stage lights and their use:
http://www.mts.net/~william5/sld/sld-500.htm

You should be able to access it with an iphone.

Hope this helps.

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