Fluorescent means the property of emitting visible light due to the absorption of radiation of a shorter wavelength which may be outside the visible spectrum.
Observation angle means the angle having as its sides the line from the observation point to the center of the object to be tested and the line from the center of that object to the center of the source of illumination (Figure 2).
Reflex reflective means reflective of light in directions close to the direction of incident light, over a wide range of variations in the direction of incident light.
Boundary | Equations |
Yellow | y = 0.33 |
White | x + y = 0.98 |
Boundary | Equations |
Yellow | y = 0.49x + 0.17 |
White | x + y = 0.93 |
Red | y = 0.35 |
The 150-watt high pressure xenon compact arc lamp shall illuminate the sample using the unmodified spectrum at an angle of incidence of 45° and an angle of observation of 90°. If dual purpose material is being tested, it shall be illuminated by a 150-watt high pressure xenon compact arc lamp, whose light is diffused by an integrating sphere.
FIG. 1-DIMENSIONS OF WARNING DEVICE (INCHES)
49 C.F.R. §571.125