Well, your tree is suffering from significant change in light conditions. Meyers are particularly sensitive to that and you may lose most or all of your leaves. Keep doing what you are doing and it should recover, replacing the old leaves with new leaves better suited to the current light conditions.

A would also stop misting the leaves to encourage the roots to take up moisture..

Also too, keep a close eye on the mix that it is not staying damp for too long..

It's true that they will drop leaves to light changes, especially too if just coming from a perfect environment such as a greenhouse to yours...

Great idea with the light, but be careful about waering until you know the roots are doing there job...

Hope it all goes well...Please keep us updated//Boy, the ability to put them outside into sun and warmth could not come fast enough.

MIke

I'm also growing meyer lemons in MN, so it's possible!

1) I'm supplementing with GE daylight CFLs during the winter, and that seems to be working.

2) Make sure your pot and soil promote good drainage. You don't want the soil to stay damp.

3) I'm having really good luck with a fertilizer called "Foliage Pro" that you can buy off of Amazon. The littlest bottle will last you well over a year. 1 teaspoon per gallon of water, and it doesn't hurt to add one teaspoon of white vinegar per gallon of water. I water about once per week or so. When you notice the surface of the soil is dry, then give it a really good dose of water, but don't water it every day. If your air is dry, you can try misting the leaves every once in a while.

Good luck!