c.
External Originating Light. Light sources may be placed directly
over the viewports. This eliminates the internal heat sources and internal
electricity for the lights but the loss of view is sacrificed for each light
utilized. A word of caution: Heat from the external lamp must not raise the
temperature of the viewport window above 113 deg. F. The heat from external
lamps can be dissipated in various ways as shown in Figure 9-8.
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