The ones not in bloom, but why move them? In my experience, Phals can take a lot of sun once they acclimate. Maybe just set them back from the windows a bit. Plus, once summer gets here and the sun is more directly overhead it should not be 'shining' through windows as brightly.

All of mine go out on an east patio in May'ish, protected from direct sun for a few weeks and then left to their own accord.

If you have lots of skylights, that's another story and you may need to move them.

Good luck,

Bob
Bob

What indications does the plant show that you they are getting too much light?

My sunroom is basically 3/4 greenhouse with skylights etc. The leaves are slowly burning and I honestly don't have enough area that is shaded to accommodate all my orchids. Plus, it would be lovely to have them in other parts of my home, since I think they will do ok there.

I will continue to get more Phals. Wish I could get others, but my florist friend donates all their past bloom plants to me, so I get 1-2 per month...sometimes more! So, they need to find new places in my home that will work.

In summer, the sunroom gets over 100F unless I vent it. Since we still have snow on the ground, I can't put them outside.

On this forum I have noticed that latitudes make a difference in terms of solar exposure for phals. Bob in this thread allows some direct light also in zone 6. It appears your sun room is too bright. Here in zone 10 they can't hardly tolerate any direct light. Try the move...

I agree considering you have lots of skylights. Move the ones that aren't blooming, if the blooming ones are struggling, I'd move them also.

Good luck,

Bob

I am at latitude 42. We get direct sun in the sunroom all day which my citrus, tropicals, tomato and pepper plants love, but my Phals need some shade. I won't add any shade cloth since I grow other things in there and I LOVE the heat. In the dead of winter I like to let it heat up and hang out in there in my swimsuit :) It helps me hate the winter a tiny bit less.

So, the suggestion is to move those not in bloom? What about the ones that are spiking?

All orchids in bloom around here are subject to be moved to the pleasure of the humans. When not in bloom move it back to the bright room with less direct light. I would wait until the flowers start to open to move it in your best viewing spot. With phals that means a couple of months. Then back to the new spot.

Just in the interest of discussion and maybe that you might gather a little snippet of useful information. Have a look at the link.

Slightly warmed glass-house

Sorry about the link, anyway it shows the wall of a glass-house where I grow Tolumnia Hybrids. (Phalaenopsis Death Zone)

Go down several feet to the benches where there are mainly Cattleya Hybrids and down several feet to the aisle floor where I summered the Phalaenopsis.

The point being that there are micro-climates in that glass-house that is set for what I call Tropical Savannah Conditions. So in your sun room there must be several sets of conditions.

If you do not want to put shade on the roof there is nothing to stop you putting a neat shade-cloth fitting over your Phalaenopsis to prevent them being burnt.

Of course, in the fiddling about process you need some instruments like a maximum/Minimum

Thermometer and a humidity gadget.

Hopefully, I'll get some blooms next spring from my small collection of Phalaenopsis now enjoying there winter quarters where it is 23.1C with 76% humidity.

This room is slightly warmed by the 600 Litre fish tank but because the house is not centrally heated I should get enough of a temperature drop during winter to initiate blooms.