Double LED Lights Bathroom Lighting in Antique Cooper, Black Antique Brass. With well designed direct luminaires, the luminance of the aperture will be equivalent to the luminance of the ceiling. This results in minimal brightness contrast between the luminaires themselves and the surrounding ceiling plane. With a well designed indirect system, the light received on the ceiling plane exhibits an even luminance. The underside of the indirect luminaires must have approximately the same luminance as the ceiling plane.
2 Lights Bathroom Lighting, Cooper, Black Brass
Downlighting versus Uplighting
The appearance of a low brightness direct lighting system differs considerably from that of an indirect lighting system. The direct system produces negligible luminance on the ceiling plane and puts great emphasis on the horizontal work surface, furniture, and fl oor coverings. The indirect system places luminance emphasis on the ceiling plane and de‐emphasizes the surfaces in the lower half of the room. A direct‐indirect system accomplishes both.
Three dimensional objects are perceived as a result of the relationship between highlight and shadow. Concentrated beams create higher contrast and deeper shadows, emphasizing form and texture. Frontal lighting located in the horizontal plane between 30° to 45° from the center of an object and in the vertical plane 30° to 45° from nadir models objects in a manner that replicates sunlight.
Lighting a vertical surface behind an object creates a luminous backdrop that separates the object visually from its background, much the way an actor is separated from the scenery on a stage. Lighting an object from the side as well as from above provides added dimension to the piece.
Vanity Lighting in Antique Copper, Black Brass
Evaluate the daylight fi rst, because it contains a much higher proportion of UV than do electric sources. The highest quality UV filters for daylight are made of acrylic and other plastics formulated to eliminate the transmission of UV but allow the passage of visible light. They are available as self‐supporting sheets used in place of glass, as thin acetate applied to glass, and as varnish.
White paint is also a good UV absorber. If all light entering a room is refl ected at least once from a white surface, the UV problem will be solved. Titanium dioxide pigment is optimal for this purpose, but zinc white is also a good absorber.
Second, evaluate the fluorescent and HID lamps. Although they emit UV radiation less strongly than daylight, all discharge lamps require UV filters.
Fluorescent and HID lamps with correlated color temperatures above 3100 K need careful attention, because both UV and short‐wavelength visible radiation increases with color temperature. Plastic sheets of UV‐absorbing material are available from manufacturers of color filters.
With the quantity of light maintained at 5 to 15 fc, radiant heat is also controlled to reasonable limits. Lamps should be located outside exhibition cases and ventilated with air that avoids traveling directly past the exhibits. Dichroic cool beam lamps are useful. Their color appearance is somewhat cooler than that of standard sources; the color rendering, however, is undisturbed.
Third, evaluate the time of exposure. Exposure is the simple product of illuminance and time. The same amount of damage will be produced by a large quantity of illuminance for a short time or a small quantity of illuminance for a long time. If the illuminance is halved, the rate of damage is halved. The optimal strategy is to reduce both illuminance and time of exposure.