It is not proven, but people say, that two days of darkness may trigger your plant to develop a trichome shield. It prepares for the strong light, while beeing set in darkness. People say your plant will start producing more trichomes to protect it self from the light it is not used to anymore. I don't know, if its true, but I did this on my last grow and will keep doing this, because even if it does not work... losing two days after more than three months, is not that big of a deal, I guess 😄