Anyone know or can easily measure the c.p. of a "typical" 60W light bulb?
I have some old contact printing data for a paper that says that typically, an exposure of X seconds at a distance of 50 cm, to a 50 c.p. light source should be just about right.
So, what would this be in terms of todays (?) tungsten light bulbs?
What are typical c.p. values for 60 light bulbs of today?
I have found confusing and conflicting information,
but so far, the values I have come up with are:
60W= 64 - 72 cp
Anyone know if these figures are anywhere near correct?
I have some understanding of the many issues involved here, but as given, it was thought that the rating in c.p. as given at the time the paper was made, would be useful to people with differet lamps... I think it must have at least some "ballpark" accuracy,
so a crude approximation is fine....