Angles of geometric visibility definition

Angles of geometric visibility means the angles which determine the field of the minimum solid angle in which the apparent surface of the lamp is visible. That field of the solid angle is determined by the segments of the sphere of which the centre coincides with the centre of reference of the lamp and the equator is parallel with the ground. These segments are determined in relation to the axis of reference. The horizontal angles ß correspond to the longitude and the vertical angles α to the latitude.
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Angles of geometric visibility means the angles which determine the field of the minimum solid angle in which the apparent surface of the lamp must be visible. That field of the solid angle is determined by the segments of the sphere of which the centre coincides with the centre of reference of the lamp and the equator is parallel with the ground. These segments are determined in relation to the axis of reference. The horizontal angles β, correspond to the longitude and the vertical angles α to the latitude. There must be no obstacle on the inside of the angles of geometric visibility to the propagation of light from any part of the apparent surface of the lamp observed from infinity. If measurements are taken closer to the lamp, the direction of observation must be shifted parallel to achieve the same accuracy. On the inside of the angles of geometric visibility no account is taken of obstacles, if they were already presented when the lamp was type approved. If, when the lamp is installed, any part of the apparent surface of the lamp is hidden by any further parts of the vehicle, proof shall be furnished that the part of the lamp not hidden by obstacles still conforms to the photometric values prescribed for the approval of the device as an optical unit (see Annex 3 of this Regulation). Nevertheless, when the vertical angle of geometric visibility below the horizontal may be reduced to 5 (lamp at less than 750 mm above the ground) the photometric field of measurements of the installed optical unit may be reduced to 5 below the horizontal.
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Angles of geometric visibility means the angles which determine the field of the minimum solid angle in which the apparent surface of the lamp shall be visible. That field of the solid angle is determined by the segments of the sphere of which the centre coincides with the centre of reference of the lamp and the equator is parallel with the ground. These segments are determined in relation to the axis of reference. The horizontal angles ß correspond to the longitude and the vertical angles α to the latitude. There shall be no obstacle on the inside of the angles of geometric visibility to the propagation of light from any part of the apparent surface of the lamp observed from infinity. If measurements are taken closer to the lamp, the direction of observation shall be shifted parallel to achieve the same accuracy. On the inside of the angles of geometric visibility no account is taken of obstacles, if they were already presented when the lamp was type-approved. If, when the lamp is installed, any part of the apparent surface of the lamp is hidden by any further parts of the vehicle, proof shall be furnished that the part of the lamp not hidden by obstacles still conforms to the photometric values prescribed for the approval of the device as an optical unit (see Annex 3 of this Regulation). Nevertheless, when the vertical angle of geometric visibility below the horizontal may be reduced to 5° (lamp at less than 750 mm above the ground) the photometric field of measurements of the installed optical unit may be reduced to 5° below the horizontal.
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Examples of Angles of geometric visibility in a sentence

  • The Access Board was originally required to complete its regulations by February 7, 2000.

  • Part C: Side marker lamps Figures A2-III Angles of geometric visibility, horizontal and vertical Horizontal angles Vertical angles Table A2-3 Angles of geometric visibility, horizontal and vertical Lamp Min.

  • Part B: Side direction indicators and side parking lamps Figures A2-II Angles of geometric visibility, horizontal and vertical Horizontal angles Vertical angles Table A2-2 Angles of geometric visibility, horizontal and vertical Lamp Horizontal angles (A/B) Min.

  • Prior to issuance of a grading permit, building permit, or occupancy, the applicant shall submit a tree planting and irrigation plan prepared by a licensed arborist or landscape architect for the administrative review and approval of the Zoning Administrator.


More Definitions of Angles of geometric visibility

Angles of geometric visibility means the angles which determine the square field in which the light-emitting surface of the lighting device is completely visible when the relevant angles (• vertical and • horizontal) are measured at the outward contour of the apparent surface and the lamp is observed from afar, however, if any obstacleobstacles is located insidewithin this field whileand partly obscuring the light-emmittingemitting surface, it may be accepted whenwhere it is proven that, even with such obstructions, the photometric values prescribed for the type-approval of the lighting device as component are still complied with;
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Angles of geometric visibility means are operated together.
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Angles of geometric visibility means the angles which determine the field of the minimum solid angle in which the apparent surface of the lamp shall be visible. That field of the solid angle is determined by the segments of the sphere of which the centre coincides with the centre of reference of the lamp and the equator is parallel with the ground. These segments are determined in relation to the axis of reference. The horizontal angles β, correspond to the longitude and the vertical angles α to the latitude;" Paragraphs 2.14., amend to read:
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Angles of geometric visibility means the angles which determine the minimum solid- angle zone in which the apparent surface of the lamp must be visible; this solid-angle zone is defined by the segments of a sphere whose centre coincides with the centre of reference of the lamp and whose equator is parallel to the carriageway; the segments are determined from the axis of reference; the horizontal angles beta correspond to longitude, the vertical angles alpha to latitude; within the angles of geometric visibility there must obstacle to the propagation of light from any part of the apparent surface of the lamp; no account is taken of obstacles existing at the time of approval where required, of the lamp.
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