Ive read somewhere that marijuana uses the trichomes and resin that accumulates on the stalk as LENSES in order to focus light in a way that benefits the plant...and also that the resin serves as a sort of sunscreen, which in itself seems a bit contradictory, unless you understand that marijuana does have preferred spectrum that the plants absorb more efficiently. Depending on the genetics of the plant, indicas vs sativas or whatever, they may prefer different light because of the adaptations to that particular environment it was cultivated in. Ive read that the plant itself originates from an arid (xeric) part of the world, and that it is efficient in heat dissipation, which is why it stands out to a chopper with FLIR in the midst of cooler plants (grass or whatever). The resin may focus a specific spectrum of light and diffuse other spectrums that the plant doesnt want or need.