I'm an indoor grower but if that was true, I imagine most growers would utilize shade cloth in some way. Lots of things can affect the appearance of trichomes, including handling, foliar spraying, rain. On a naturally grown plant the fan leaves would shade the trichomes on the developing buds, presumably shielding them from deleterious solar radiation. Using led lighting, I like my temperature in the mid 80s. Back in the day with HPS lighting, cooling was the battle because the radiant heat was so strong. Not nearly so much now with good ventilation and/or avoiding living in the Mojave Desert.