In my experiences of basically hybrids they spike when ever the conditions are suitable.
If you have enough leaf growth & the plants experience some cooler nights they spike.
My mum has a Phal noid that has been in flower since May '04(only 2 flowers left but it has thrown up a new spike is flowering.
I have 1 that i cut the spikes off , put it in s/h & put it outside for the summer & it spiked in 5 weeks.
They basically spike anytime.