I do not have your problem because mine are in an non centrally heated home, so I think you need to get some tricks of the trade from growers who live in the Colder parts of the USA.
That said, there are a few that bloom at times other than spring so the slight cooling down might not work for all the Phals. in your collection.

All I can tell you is that the couple of Specialist Growers in our local society here with Phalaenopsis set glass-houses defer putting the heating on in Autumn for a couple of weeks. Night temps would dip into 50's F.

My Phals spiked indoors in New York City, which has the same climate with yours. I would keep windows in that room open, unless it became too cold for me, and then I'd close them. I did not stress out too much to achieve the 10-20 degree drop, but they did spike anyway. They are not even by the windows (which is where the drop would be bigger), but under lights across the room.

Re grow lights: what kind do you have? LEDs do not produce heat at all, T5s only a negligible amount, older fluorescents a bit more, HIDs do produce a lot of heat, but they also produce too bright light levels for Phals. Rather than using grow lights, a heating pad is a better idea for providing heat - on a timer if you want a drop.

Anyway, lots of ideas, but here it's very important to know your environment, the light levels and the temps different places in your house get. We do not know any of that, except for very limited info you gave us. Read what Phals need, then find in your space where they can get something close to that. Absolute majority of them are not too fussy about any of that anyway, and it's not exact science.

I am also a fan of not changing several things at once, or of changing things very often - because then you cannot learn from the plants' reaction. Did they react to change A at time 1 or to change B at time 2? Because you do not know the answer, the anguish and guessing will continue forever. The way to overcome that is to change one thing, then observe the reaction and learn what your particular plants like.

Good luck and let us know how it goes.

Since I put them in that room a week or so ago, their roots look very vibrant and healthy. I just worried they would not be warm enough during the day and the temps would be too similar, which is kind of cold. But, moving them around from warm to cold could be more shock than what they like to get a spike or remain healthy.

Were these plants outside during the summer? You need to add more info.

I grew in NY and my Phals stayed outside until they spiked, which was usually around September. Then they came inside. I kept my house on the chilly side but during the day it warmed up. There was at least a 10-degree difference between night and day in the house.

I wouldn't fuss too much. as Greentoe said, 'don't stress about it.' My experience is that if you start changing things around radically, you'll mess up. Believe me, your house is warmer in the day than night. If they are going to spike, they should be doing so by now.

Jane

There are some crazy looking, made in China, square LED panels that advertise that they're for flowering or hydro or different stuff like that. I don't really understand it but some of them are real low wattage and cheap. Who knows if they work or not.

Hi Jane , I did not put mine outside, I was too worried they would get bugs. I had a horrible problem with my annuals and perennials the past two years, I could not risk them getting on the orchids.

Our weather really only started to dip at night, so I donthaveany spikes yet. Is it too late now For them to set a spike?

I think / hope they could still spike. Mine just set spikes a few weeks ago. My Dendrobium also spiked more than a month later than the same Dendrobium growing with a friend in the same city. Different conditions can lead to drastically different spiking times, so I would not be discouraged just yet.

Cooper, consider starting a separate thread for this separate topic - you will get a better response than if the question is buried in the middle of another thread. There is even a separate forum here called "Growing Under Lights". I used to read it and hang out there when I was choosing my lighting technology and specific products. That forum can get a bit technical, so then maybe post here if you grow mostly orchids or in "House Plants" if you grow anything or if you think it does not matter what you grow - because that forum is more active than this one.

Sorry. My point is that there may be a way to make the plant form a spike by using a certain kind of light. I'll shut up now.

My apologies, Cooper, I did not mean to shut you up at all. The intention was to get you the most answers to what appeared to be an unrelated question. I understand Jeannie's problem is temps, not light, at least as far as she thinks, but of course you may also be right that the light is lacking.

Jeannie, give them a while. I'm sure your house temps are lower at night unless you keep your thermostat at the same temp.

Do you have them near a window? They should be spiking but I actually looked today and I have two which are not. We are warmer but have had cooler nights. Mine might be spring bloomers (not my plants, I flower phals for a few dentists in the area).

Give them another month. Yours could be Spring bloomers.

Jane

Hi all,
From what I have heard from Phal growers, here in Holland, they put the plant at a little lower temperature 3 -> 5 degrees Celcius and then a healty strong plant will form a spike when the spike is big enough they will move it back to a warmer spot forcing the spike to bloom. An interresting youtube video about a real big nursery here in Holland.

http://www.youtube.com/watch?v=laXih_1mdUI

That the way to grow phals isn't it ?
Alfred.

Hi all,
Sorry for the dubble post, my browser or slow internet was playing op and I did put the link to Laak Orchids on the wrong place
Alfred.

Here is a link that might be useful: Laak Orchids

This post was edited by scorpio_bafh on Wed, Nov 12, 14 at 5:16