Take them off of the heat mat. Heat is only needed for germination. I would leave the lights on 12 to 16 hours a day with the lights being just a few inches from the seedlings. If you worry that the soil is too wet you can put a fan on them set on low speed. It will dry it up and also help make stronger plants.

Thanks franknjim!!!

I'm taking them off the heat mat today cause I think the germination process is done (about 75%!!). I plan on transplanting the junior impatiens in six pack cells with a non-soil mixture. They will be in my basement with fluorescent lighting for 16 hours each day. I plan on covering them with plastic lids. I hope I have this right.
Again any thoughts and assistance would be much appreciated!! Again, thanks franknjim!!!!!

They won't need to be covered once they are up. Covering them is to keep the humidity high during germination.