Found more info on thermal mirror effects, see around 12m @ <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=RGqZZthc_l4" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=RGqZZthc_l4</a>