fireball40k Posted October 31, 2011 Share Posted October 31, 2011 Please forgive my ignorance but can anyone fill me in on the origins of theatre lamp numbering schemes (part numbers)? In particular, why is a lamp like T11 also known as T19? Why is a T13 also known as T22? Same with CP72/79/43. Are these alternatives the same or do they differ in some minor way (i.e. colour temp, lifetime)? If they're the same, why have two numbers? I believe that T stands for 'Theatre' whereas CP refers to Studio/Film grade - is that true? What is the meaning of 'CP'? I've had a quick search for articles on this with no great success - any pointer to relevant sources would be appreciated. Thanks Steve Link to comment Share on other sites More sharing options...
Ynot Posted October 31, 2011 Share Posted October 31, 2011 Er, you could do worse than start here, at the BR Wiki... Link to comment Share on other sites More sharing options...
Brian Posted October 31, 2011 Share Posted October 31, 2011 ...why is a lamp like T11 also known as T19? Why is a T13 also known as T22? Same with CP72/79/43. ...They're not. They are different products designed for different applications. More info here. Link to comment Share on other sites More sharing options...
fireball40k Posted October 31, 2011 Author Share Posted October 31, 2011 Er, you could do worse than start here, at the BR Wiki...Thanks Tony, forgot about the Wiki... Link to comment Share on other sites More sharing options...
Neil Hampson Posted November 1, 2011 Share Posted November 1, 2011 I believe the 'CP' was for 'Colour Photography' Link to comment Share on other sites More sharing options...
Jivemaster Posted November 1, 2011 Share Posted November 1, 2011 The class of a lamp covers things like colour temperature, envelope form, lamp chemistry, and intended orientation (some lamps are for cap UP use some for cap down either +/- so many degrees. For filament lamps the class indicates the filament shape and may make it more suitable for some reflector systems, some are better prefocused for their intended use. Link to comment Share on other sites More sharing options...
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