$AVOP The LED lighting sector is an intricate key to the indoor agricultural environments that these harvesting facilities represent, since the majority of these crops are grown indoors. U.S. retail cannabis sales will rise more than five-fold over the next five years, from an estimated $2.2-$2.6 billion in 2014 to $7.4-8.2 billion in 2018, according to an article recently published by Marijuana Business Daily.