A light tight curtain can be made from black vinyl, or other opaque material, with a reflective material on the other side to reflect light back to the marijuana plants.
Ikhethini eliqinile elikhanyayo lingenziwa nge-vinyl emnyama, noma enye into e-opaque, ngento ebonakalayo ngakolunye uhlangothi ukubonisa ukukhanya emuva ezitshalweni zensangu.