User talk:ProjectionHead

Welcome!
Hello, ProjectionHead, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are a few links to pages you might find helpful: Please remember to sign your messages on talk pages by typing four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or and a volunteer will visit you here shortly. Again, welcome! WikiDan61 ChatMe!ReadMe!! 20:16, 9 December 2014 (UTC)
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Screen gain
Your edits to Gain (projection screens) introduced incorrect facts, although to be fair, the article was already full of incorrect facts before you got to it. Your edits implied that the amount of light reflected from a screen might possibly be higher than the amount of light impinging on the screen, which for a passive screen is physically impossible. The term "gain" in this usage is not true gain in the engineering sense. An amplifier can introduce gain by inputting a signal with low power and outputting a signal with high power (using power derived from the power supply). A passive screen cannot introduce gain in this sense. The term "gain" as applied to projection screens would be better called a "figure of merit" by comparing the output of the system (in this case the reflectance of the screen) to a known standard (in this case a sheet of magnesium carbonate). I have rewritten the article to reflect this proper interpretation. WikiDan61 ChatMe!ReadMe!! 20:16, 9 December 2014 (UTC)