Dendrobium aggregatum max. night temperature for blooming

[rockyfarm]

My grow room runs 76 to 78 degrees days and I pull it down to 60 at night. The photoperiod may indeed be too high for blooming; I've read that most orchids are not sensitive to light duration, but it bears checking. I'm putting one of my D. aggregatum and one D. loddigesii out in my garage where they'll be down in the 40's at night, and under a light that I'll set at 11 hours.