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96 AMATEUR MOVIE MAKING
worry ourselves with a heavy, ungainly lamp. Fortunately, the modern light sources are so easily handled that the illumination of an interior is a pleasure rather than being a drudgery.
And then of course, these lamps must present an appearance which is in keeping with the cameras and projectors used in modern amateur cinematography.
In the consideration of initial illumination, we cannot judge the source of light by its initial candlepower, although this serves admirably as a basis of comparison of similarly colored lights. Thus, in comparing white flame arcs, the comparison of their candlepowers will give us a definite conception of their comparative efficiency, when used under similar circumstances. We cannot, however, compare incandescent lights with arc lights upon the basis of their relative, visual candlepower, because the incandescent is yellow and the arc a white light. The arc will have more effect upon the film per candlepower than will the incandescent light. Yellow light is comparatively inactive from a photographic standpoint, except where panchromatic film is used.
The most practical application we make of the estimation of the intensity of the light is that used in calculating the proper exposure. It is evident that Ave must know something, either directly or indirectly, of the intensity of the light being used before we can even approximately calculate the exposure. We may not consciously judge the light as being of such and such a candlepower, but we do judge it as requiring the use of some particular lens stop.
We have seen that we photograph objects by means of the light reflected from the surface of such objects. It follows therefore that the amount of light reflected from any given surface is proportional to the amount of light which falls upon it originally, as well as upon the reflecting properties of the surface. Then if a definite amount of light falls upon a group of objects, they will reflect definite proportions of the original light in relation to their power of reflection. Thus we see that through varying reflection we get the differentiation between any two objects, while the total tonal scale of the reflected light de