Phal venosa - forcing rebloom

[ladyslipper]

Hello all, I am sure this has been covered but I cannot find the info...can someone tell me how low the night temps need to be in relation to the day temps and for how long do we need to lower the night temps (a month, two months?)to cause a phal to rebloom.

thanks
ps do paphs have these same requiremnts to rebloom successfully?

m