When/ how do cattleya orchids grow flower spikes?

[Tropicgirl]

Phals can be tricked into blooming by exposing them to cooler temps at night. I'm pretty sure catts are the same. Not sure what the day to night temp difference should be but I'm thinking 10 degrees. Maybe someone else knows for sure.

What kind of light do yours get? Since they are indoors, I'm thinking the catts may need a higher light level to flower?

I let mine cycle as they want and since they are outdoors all year they got the cold they needed and some are blooming for me now.