The Effects of Two Instrument Lighting Systems on Dark Adaptation PDF Download
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Author: Lawrence R. Wilcox Publisher: ISBN: Category : Aeronautical instruments Languages : en Pages : 42
Book Description
Four pilots with normal vision were tested for the effects of the standard indirect red and red-flood aircraft lighting systems on dark adaptation. Data were gathered in a completely blacked-out cockpit while the aircraft was in a hanger and also during conditions of normal night flight. Significant differences in dark adaptation thresholds were found between the hangar and flight phases and between the low and high levels of light intensity used. No significant differences were found between the types of lighting systems used. It is concluded that the flight conditions of starlit night sky affect dark adaptation levels to a significant degree.
Author: Lawrence R. Wilcox Publisher: ISBN: Category : Aeronautical instruments Languages : en Pages : 42
Book Description
Four pilots with normal vision were tested for the effects of the standard indirect red and red-flood aircraft lighting systems on dark adaptation. Data were gathered in a completely blacked-out cockpit while the aircraft was in a hanger and also during conditions of normal night flight. Significant differences in dark adaptation thresholds were found between the hangar and flight phases and between the low and high levels of light intensity used. No significant differences were found between the types of lighting systems used. It is concluded that the flight conditions of starlit night sky affect dark adaptation levels to a significant degree.
Author: John Lott Brown Publisher: ISBN: Category : Bars (Engineering) Languages : en Pages : 30
Book Description
"The need for systems of illumination which will afford the maximum stimulation of the eye at low luminances has led to the widespread use of red light. The theoretical basis for the advantage of red light is reviewed. Several methods for the practical specification of illumination which are based on a cone-to-rod luminous efficiency ratio are considered. These methods are analyzed and compared in terms of the actual physical significance of the numerical values which they yield. It is evident that no method of calculating a cone-to-rod ratio provides an index from which the effects on sensitivity after adaptation to a given illumination system can be predicted. The general problem of specification is discussed in relation to a number of the underlying practical problems, such as luminance level at which a given illumination system must be used, the nature of the visual tasks for which it is provided, and the nature of the visual tasks for which sensitivity must be preserved. It is concluded that a cone-to-rod luminous efficiency ratio may afford a satisfactory index for the specification of lighting systems. However, the use of such a ratio to predict the effect on eye sensitivity of exposure to different lighting systems must await a careful experimental investigation of the relations among cone-to-rod ratio, luminance, and criteria of sensitivity within the context of specific practical situations."--Abstract.
Author: Kenneth T. Brown Publisher: ISBN: Category : Aeronautical instruments Languages : en Pages : 48
Book Description
"The effects of pure red and low color temperature white flood lighting upon completely dark adapted visual thresholds have been determined. The red light was adjusted to brightness levels which pilots have been found to use as the minimal, normal, and maximal levels for night flying. For each brightness level of the red light, a brightness was found for the low color temperature white light at which aircraft instruments were equally legible under the two lighting systems. Both a simulated instrument panel and a pure white panel were used as viewing panels. Six subjects were tested under each lighting condition. A higher brightness proved necessary with the low color temperature white light than with the pure red light in order to attain equal legibility of instruments. Both lighting systems at all brightness levels caused small increases in visual thresholds above the completely dark adapted state. When the simulated instrument panel was illuminated at the normal brightness level, thresholds after viewing low color temperature white light were 0.15 log micro-microlamberts above thresholds after viewing pure red light. This value defines the approximate sacrifice in dark adaptation which would be made if white lights, operated at low voltage, were substituted for red lights in flood lighting aircraft instruments. The white lighting would also be more visible to dark adapted enemy observers. However, the white lighting system would make colors in the cockpit appear more natural, which would facilitate such tasks as map reading. When operated at normal voltage, the white lighting system could also provide high intensity illumination for special purposes such as thunderstorm flying, very high altitude daytime flight, and simulated instrument flying with the amber hood and blue goggles."--Abstract.
Author: Aerospace Medical Research Laboratories (U.S.). Behavioral Sciences Laboratory Publisher: ISBN: Category : Aviation medicine Languages : en Pages : 92
Author: Aerospace Research Laboratories (U.S.). Behavioral Sciences Laboratory Publisher: ISBN: Category : Aviation medicine Languages : en Pages : 124
Author: Lawrence R. Wilcox
Author: Lawrence R. Wilcox
Author: Jennie Gatti
Author: John Lott Brown
Author: Kenneth T. Brown
Author: Armed Services Technical Information Agency (U.S.)
Author: Lavon E. Trygg
Author: 
Author: 
Author: Aerospace Medical Research Laboratories (U.S.). Behavioral Sciences Laboratory
Author: Aerospace Research Laboratories (U.S.). Behavioral Sciences Laboratory