I don't remember where I saw it, maybe here or on another forum,but someone made a really good point about catts now a days.

Todays catts are so diverse in their background that they don't all have a set dormancy time. All mine are hybrids and really don't have a defined dormancy period. You would think that winter time in a basement would be a quiet time but I have roots and shoots going everywhere. It really is time for me to divide and repot,not sit on my hands. So treat your orcs the way they are telling you to treat them. If you too have new roots and shoots, keep feeding them or divide and repot,whatever needs to be done. And like Nick says, if you really like it keep a spare of the divisions.ginnibug

yah i realy dont mind them growing all winter like this just dont want it to be a bad thing and perhaps kill them... most of mine are named hybrids / a couple species...iv only had them for like 8 or 9 months depending on what batch ;p iv had phals in the past but i was new and didnt do my research and drowned them / the medium decomposted too much and kill em ;p iv done alot of reading up this time ..... and what iv read is that there pretty much dormate with maybe a little root growth in the winter.... ;p

Ginnibug is right, some Cattleyas do not have a dormant period. They grow and flower several times a year. Others bloom in Autumn and only grow a new pseudobulb in spring to flower the following late summer/autumn.
Others appear to need a cool winter to flower in spring.
All you can do is try and see what happens, maybe swap notes with indoors under lights all year growers.

This is my first year using lights over the winter.I am using them to supplement the natural light coming from a western window. I have noticed that my most of my Catt species and hybrids under the supplemental light are producing new roots and pbulbs. I even have a couple in bud. My Catt hybrids close to a Southern window are still active but a lot slower. Natural light is pretty limited during the winter in North East Ohio. I lightly fertilize both sets during the winter. I agree with others that many Catt hybrids don't have a rest period. Many of the species may slow down without a distinct rest.

What Dens do have? Many Dens don't completely rest either. For example, my D. antennatum is producing new pbulbs in a southern window.