The architecture of light: architectural lighting design concepts and techniques. A textbook of procedures and practices for the architect, interior designer and lighting designer pdfdrive com

INTEGRATING WITH ELECTRIC LIGHT
Whether our daylighting ingredients are functional or aesthetic, it is necessary to consider how they can substitute or work in harmony with electric light. In design applications it is worth investigating how a particular daylight effect can be recreated with electric light, or vice-versa. It allows a space to have similar light textures in varying sky conditions throughout the day and the year.
Consider how shelves, slots, coves and coffers can be fitted with components of
both electric light and daylight. Consider also the decisions that help the two systems work in harmony: intensity, color and shape.
Intensity:
Technology allows us to respond to the daylight we are receiving by automatically reducing the intensity of the complementary electric light system. Photocells can send signals to dim or step down the output level of the electric light system. Photocells can also activate shading systems in the case of excess daylight. If your goal is to use daylight to reduce or replace electric light, a thorough study of technologies like photocells, dimmers, and time clocks is in order.
Color:
Coordinating daylight use with electric light also demands careful consideration of the color temperatures of light that are being introduced to the space. The color of both skylight and sunlight are entirely variable. Skylight can range from the pale blue of a clear morning to the murky cool of a cloudy day to the violets and pinks of a sunset. Direct sunlight can vary from a warm glow to a brilliant orange. Both, however, seem to have an uncanny knack for showing off the unnatural look of the colors of our electric sources. Because daylight components by nature have perfect color-rendering capabilities, they tend to show off the deficiencies of our
electric systems. Electric light can look very unnatural when it is shown up by daylight. Because of the great variance of daylight, it is not suggested that your electric light sources necessarily try to match the color temperature of your daylighting ingredients; it is simply one more facet of light to consider.
Shape:
Integrating daylight and electric elements together also requires consideration of the shape of light. Daylight tends to be delivered in long, clean pieces and planes. Our long, linear electric sources can do a good job of harmonizing with these elements. Daylight can also be delivered in clean directional beams and pools when produced by small apertures and devices like solar light tubes.
The point is to take control of daylight and expand concepts of what can be accomplished with it. Almost any source of electric light has a proper daylight counterpart. The responsibility is simply to investigate the possibilities and think through every design decision.