For these materials, a widely used method for quantifying both properties is described in the industrial standard ASTM D1003 Standard Test Method for Haze and Luminous Transmittance
of Transparent Plastics , The standard defines haze as the percentage of the total light transmitted through the sample which is scattered by >2.5[degrees] from the direction of the incident beam, while luminous transmittance
is defined as the ratio of light transmitted through the sample and the incident light.
4 (gray) [[tau].sub.vi] [%] 3,50 [[tau].sub.vs(380-780nm)i] [%] 6,51 [[tau].sub.vs(425-560nm)i] [%] 3,90 [[tau].sub.Mbi] [%] 4,15 [[tau].sub.Mai] [%] 3,92 [[tau].sub.Mti] [%] 3,93 [[tau].sub.Ms] [%] (M [+ or -] SD) 4,00 [+ or -] 0,13 [P.sub.i] [%] -12,86 [[tau].sub.vi]--wspolczynnik przepuszczania swiatla, uwzgledniajacy rozklad wzglednej skutecznosci swietlnej widmowej dla widzenia fotopowego i rozklad illuminantu D65, dla probki i (i = 1, 2, 3, 4) / luminous transmittance
coefficient which takes into account the distribution of the relative spectral luminous efficiency for photopic vision and the resolution illuminantu D65, sample i (i = 1, 2, 3, 4).
Tints should not impact on the pilot's colour perception and a minimum luminous transmittance
of 20% is recommended.
This type of substrate has high luminous transmittance
. The properties of D263T glass represent the standard for optical glass.
A series of other optical and mechanical tests also take prismatic deviation, refractive power, luminous transmittance
, optical density, optical distortion, haze, ultraviolet transmittance, chromacity, abrasion, coating adhesion, weathering and chemical resistance into consideration.
(12) The soft focus powder functions by having high Total Luminous Transmittance
(Tt) and Diffuse Luminous Transmittance
This means that VIT's holographic laminated glass complies with standards for light stability, luminous transmittance
, humidity, boil and impact by a dart and impact by a ball.
* Opacity and transparency -- usually measured as haze and luminous transmittance
. Haze is the percent of light transmitted through a specimen and scattered more than 2.5 deg from the incident beam.
ASTM D 1003-00 Standard Test Method for Haze and Luminous Transmittance
of Transparent Plastics (1992).
The new accreditation, BS 7394 part 2:2007 enables OATS to test tinted lenses, tolerances on luminous transmittance
, ultraviolet protection, suitability for road users, lens robustness and a test for the retention of the lens in the rim of the frame.
* Never drive with a luminous transmittance