Downtown street lighting and display lighting continues to get brighter and more colorful around the world, and is perfect material for digital shooting. The light sources available outside at night are the same types as those that we have just looked at, but in different proportions. Vapor lamps are used much more extensively outdoors than indoors, because of their higher output; this is particularly true of street lighting and floodlighting. Tungsten as street lighting is increasingly less common, but can be seen in shop and other windows, and as car lights. Overall, entertainment and shopping districts in cities are getting brighter and more interesting.
Although the light sources are the same as those used to illuminate interiors, their effect is very different. The scale of the usual type of outdoor shot is greater, and the surroundings do not give the same degree of reflection as do interior walls and ceilings. As a result, there is much more pooling of light: in a typical scene there are any lights, and they are localized. Only very rarely are there enough lights in a concentrated area to give the impression of overall illumination. This happens, for instance, in the busiest part of a downtown night-club district; at some open-air night-markets; and, as you might expect, in sports stadiums. A general solution to this is to shoot at dusk, when there is just a little residual daylight.
In most night-time city views, however, there is either one well-lit area, such as a floodlit building, or a pattern of small lights. In many ways, this type of light causes fewer difficulties than an interior, and there are fewer occasions when you might need to decide on the principal light source and correct the color. The impression of a color cas occurs when most of the picture area is affected; when there are other lights in the image, color balance becomes a much less important consideration.
The localization of the light sources makes measurement difficult. Use it as a guide rather than as a completely accurate recommendation, and bracket exposures around the figures given. For many night-time scenes, the accuracy of the exposure is not, in fact, very critical. Overexposure often does little harm, as it opens up the shadow areas in a scene. The best answer is to experiment, which is of course what digital cameras allow.
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