Rootless Catt's, how to use Kelpak

[Blueszz]

I'm not sure if this is the right section for my question.

I received 4 rootless Cattleya's. They are in different stages of growth, From dormant, to visible tiny new pseudo bulbs to beginning of a few roots.

I think Kelpak is my way to go.
The first day I got them I had them swim in Kelpak solution as far as I could submerge them for about 2 hours.

Tomorrow I'll install LED light. I'm living in the Northern hemisphere and days are short an dark right now.

How often should I use Kelpak on these Cattleya's?

I've read numerous old topics about this subject but the more topics I read, the more different methods I read about. Confused about what the best method is.