reflector

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I've been reading about the reflectors, and have a couple practical questions.

1. are reflectors considerably benifitual / nessicary?

2. I think I got this link from this board... http://www.kerekesequip.com/static/list/pyramid-hemisphere-triangle-molds.htm

this is a practical question, do you just drill a hole and poke the lamp through (or two holes if you are using a double ended lamp)?
How do you determine how big of a reflector to use?
I think the fresnel's I'm looking at are 200mm focal length.

Thanks
 
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