BS 2782-5:Method 540B:1982

National foreword
Method
0 Introduction
1 Scope
2 Field of application
3 References
4 Principle
5 Apparatus
6 Test specimens
7 Procedure
8 Test report
Annexes
A Correlation of the effects of exposure to artificial
   light sources and exposure to natural daylight
B Use of blue dyed wool standards to measure light
   dosage
C Spectral distribution of simulated solar radiation
D Information concerning exposure to the light from
   fluorescent tube lamps
Tables
1 Spray cycles
2 Exposure stages
3 Characteristics of fluorescent lamps
Figures
1 Spectral distribution - Lamp A
2 Spectral distribution - Lamp B
3 Spectral distribution - Lamp C
4 Spectral distribution - Lamp D
5 Spectral distribution - Lamp E

Gives methods for exposing specimens to laboratory light sources in order to assess changes produced by such exposure using xenon arc lamp, enclosed carbon arc lamp, and open-flame carbon arc lamp plus means of determining radiation dosage. The xenon arc, when correctly filtered and maintained, yields a spectrum most closely approximating to that of daylight but carbon arc sources are considerably different from daylight and their use is decreasing. Includes correlation of the effects of exposure to artificial light sources and natural daylight, use of blue dyed wool standards to measure light dosage, spectral distribution of simulated solar radiation and information concerning exposure to the light from fluorescent tube lamps.

This International Standard specifies methods for exposing specimens to laboratory light sources in order to assess changes produced by such exposure.

The following types of light source are included:

1. xenon arc lamp;
2. enclosed carbon arc lamp;
3. open-flame carbon arc lamp.

Of the different light sources, the xenon arc is advantageous in that it can, when correctly filtered and maintained, yield a spectrum most closely approximating to that of daylight. The carbon arc sources yield light which is considerably different from daylight and their use is decreasing. However, they have been found useful for some specific purposes and are still in considerable use in some countries; for this reason they have been included in this International Standard.

This International Standard also specifies means of determining radiation dosage.

For the method of determination of changes in properties after exposure, reference is made to ISO 4582.