[Cynthia, Prescott, AZ]

It is not a matter of high light or low light, but the length of the day. Both cool night temperatures in fall AND the shortening of the day length trigger blooming in Phalaenopsis. As to which is most important, I don't really know. It would have to be someone with a lot of experience growing Phals. Since most of my orchid carrier involved killing Phals, I didn't get much experience in growing them. Cynthia

A recent addition: It appears that in nature, the cloud cover in winter is less, and Phals given more light in winter are helped to initiate blooming, in addition to all the other factors. C