Your cattleya orchids, dendrobium orchids, and vanda orchids will all need supplemental light if you want them to bloom for you while growing in your indoor greenhouse. Also, with the orchids all being inclosed, be sure there is air movement within that plastic area to avoid fungal problems. Your cattleyas and Dendrobium orchids will need to dry out completely before you water them again - especially if they are not getting the normal amount of air movement. Good luck to you!

cheers,
BD