The testing done for the ISO standard seems to be based on irradiation(1). Seems fairly straight forward although I'm not sure it's tested for all kinds of radi

The testing done for the ISO standard seems to be based on irradiation(1). Seems fairly straight forward although I'm not sure it's tested for all kinds of radiation etc., but with a specific temperature and light it looks like very few other things would matter. (1) https://www.hindawi.com/journals/jpol/2016/8547524/ https://www.hindawi.com/journals/jpol/2016/8547524/